Back to easier solves. A few good anagrams and a nice charade in 3D. There's maybe a spare bit of wordplay in 13D, but it was close enough.

Across

1

Considerate reaction to sinful defilement (11)
DESECRATION — anagram (reaction) of CONSIDERATE

7

Arnold alternates with another man's name (3)
ROD — even letters of Arnold

9

Retracted account is cut out for cutting (7)
CAUSTIC — reversal (retracted) of AC (account), anagram (out) of IS CUT

10

Complete them, half-heartily sick of prevalent disease (7)
ENDEMIC — END (complete) EM (half of them) IC (middle letters of sick)

11

Songbird born in wrought iron cage (5)
ROBIN — B (born) in anagram (wrought) of IRON

12

Put in other words to ring in and put back in place (9)
REINSTATE — RESTATE (put in other words) containing IN

14

Degas novel has Noah's boat set in historical times (4,4)
DARK AGES — anagram (novel) of DEGAS containing ARK (Noah's boat)

15

Unexpected results of being well ahead in tennis (6)
UPSETS — cryptic def.

17

Free beer at a fraction off the price (6)
REBATE — anagram (free) of BEER AT

19

Sets right on crowned head or new crest (8)
CORRECTS — C (first letter of crowned) OR anagram (new) of CREST

22

Keeping from breaking bread before band (9)
DEBARRING — anagram (breaking) of BREAD, RING (band)

23

A hearing to dock chambers (5)
ATRIA — A TRIAl (hearing, without last letter)

25

Rogue at home, lying behind country seat (7)
VILLAIN — VILLA (country seat) IN (at home)

27

Heavy-handed work going into trophy (7)
AWKWARD — WK (work) in AWARD (trophy)

28

Not quite a dame and nothing like a dame? (3)
LAD — LADy (a dame, without last letter)

29

Show regular respect to attending members (7,4)
PRESENT ARMS — PRESENT (attending) ARMS (members)

Down

1

Gold at the bottom of last month's colour scheme (5)
DECOR — DEC (last month) OR (gold)

2

Nap on the first bit of soft wood (7)
SLUMBER — S (first letter of soft) LUMBER (wood)

3

Garden plant caught onto planned holiday (11)
COTONEASTER — C (caught) anagram (planned) of ONTO, EASTER (holiday)

4

Damned right to be admitted by one on trial (8)
ACCURSED — R (right) inside ACCUSED (one on trial)

5

Spain and Portugal took the lead from African land (6)
IBERIA — lIBERIA (African land, without first letter)

6

Give positive response to negative feedback (3)
NOD — NO (negative) D (last letter of feed)

7

Run riot on right morning newspaper section (7)
RAMPAGE — R (right) AM (morning) PAGE (newspaper section)

8

Women that are imposing membership fees to take over board game (9)
DUCHESSES — DUES (membership fees) containing CHESS (board game)

13

Made sure pet supply included brand of major store (11)
SUPERMARKET — anagram (made) of SURE PET containing MARK (brand)

14

Dread diabolically diabolic death-defying (9)
DAREDEVIL — anagram (diabolically) of DREAD, EVIL (diabolic)

16

Indigestible diet of love and the 27-across hug are in fashion (8)
ROUGHAGE- — O (love) anagram (27-across [awkward]) of HUG inside RAGE (fashion)

18

Shilling's shown the way of Olympic sport (7)
BOBSLED — BOB'S (shilling's) LED (shown the way)

20

Crude atmosphere to the ear of the buccaneer (7)
CORSAIR — homophone of COARSE (crude) AIR (atmosphere)

21

One engaged to cook in cafe (6)
FIANCE — anagram (to cook) of IN CAFE

24

Tops as well as bottoms of the ranges (5)
ANDES — AND (as well as) ES (last two letters of ranges)

26

Cleopatra's presumed embrace of her killer (3)
ASP — hidden in cleopatrA'S Presumed