Lots of chopped-off clues and easy anagrams, a gentle start to the week!

Across

1

Awful fathead gets legitimate support (9)
FRIGHTFUL — F (first letter of fat) RIGHTFUL (legitimate support)

6

(& 9-across) Disapprove of Kate toying with a silly opinion (4,1,3,4)
TAKE A DIM VIEW — anagram (toying) of KATE, A DIM VIEW (silly opinion)

10

A word that means the same in Sonny's version has my backing (7)
SYNONYM — anagram (version) of SONNY, reversal (backing) of MY

11

Soil empty yacht? Rick reckons it's a scam (5,5)
DIRTY TRICK — DIRT (soil) YT (outside letters of yacht) RICK

12

Campus let regulars use part of the church (4)
APSE — even letters of cAmPuS lEt

14

Instrument stored in a small room by the band (5)
CELLO — CELL (small room) O (band)

15

They measure depth of bay in grams? (9)
SOUNDINGS — SOUND (bay) IN GS (grams)

16

True, I fret about what's in the orchard (5,4)
FRUIT TREE — anagram (about) of TRUE I FRET

18

Unbridled fun if you become one (5)
UNIFY — hidden in fUN IF You

20

Could even Eliot be a bit of a brain? (4)
LOBE — even letters of eLiOt, BE

21

One who offers to do something for the mortician (10)
UNDERTAKER — double def.

25

Falls for a redhead again on the way back (7)
NIAGARA — reversal (on the way back) of A R (first letter of red) AGAIN

26

Tool he’d used to get a bit of a foot in the door? (7)
TOEHOLD — anagram (used) of TOOL HE'D

27

Keels over. Too smooth? (5)
SLEEK — reversal (over) of KEELS

28

Platypus met with no more mishaps (9)
MONOTREME — anagram (mishaps) of MET NO MORE

Down

1

Fed about a dozen then went pale (5)
FADED — FED around A D (dozen)

2

Whether Jim tipped off Mike or Al, it's unethical! (7)
IMMORAL — jIM (without first letter), M (Mike) OR AL

3

I hit toy and toy broke. So snooty! (5-5)
HOITY-TOITY — anagram (broke) of I HIT TOY TOY

4

Not as many go for first jug (5)
FEWER — F (first letter of for) EWER (jug)

5

Couldn't find a kernel of truth in the case - hopeless quest! (4,5)
LOST CAUSE — LOST (couldn't find), U (middle letter of truth) in CASE

6

Fish around like a fanatic (4)
TUNA — reversal (around) of A NUT (fanatic)

7

Call Charles and nip over with a bigwig (7)
KINGPIN — KING (Charles) reversal (over) of NIP

8

Yes, mall is developing willy-nilly (9)
AIMLESSLY — anagram (developing) of YES MALL IS

13

Notice merely meant to say 'Accommodation' (10)
ADJUSTMENT — AD (notice) JUST (merely) homophone (to say) of MEANT

14

Belt, chain or shirt fasteners (9)
CUFFLINKS — CUFF (belt) LINKS (chain)

15

Bully with a sturdy weapon (6-3)
STRONG-ARM — STRONG (sturdy) ARM (weapon)

17

Almost speechless with anger and resentment (7)
UMBRAGE — dUMB (speechless, without first letter) RAGE (anger)

19

Drop two, shirk a few. How annoying! (7)
IRKSOME — shIRK (without first two letters) SOME (a few)

22

Battered, beheaded and consumed (5)
EATEN — bEATEN (battered) without first letter

23

Not the first to span a chain of hills (5)
RIDGE — bRIDGE (to span) without first letter

24

Content to scuba, ski or lie in the sun perhaps (4)
BASK — hidden in scuBA SKi