Enjoyable start to the weekend! Only question for me is the parse of HARD in 16A, but otherwise fairly smooth.

Across

9

Leads on lines give out (9)
INVEIGLES — anagram (out) of LINES GIVE

10

Tastes decaf, regularly baffled (2,3)
AT SEA — even letters of tAsTeS dEcAf

11

Copper came across abomination by a country house (7)
CHATEAU — CU (copper) outside HATE (abomination) A

12

Cutting wide, say, and be caught behind (7)
EXTRACT — EXTRA (wide, say) CT (caught)

13

Ham-fisted dropping of opener by fine point (5)
INEPT — INE (fine without first letter) PT (point)

14

Independent politician rambling on about making it right (9)
IMPROVING — I (independent) MP (politician) ROVING (rambling)

16

Feel the pinch of autumn, regarding leaves of newspaper? (4,2,4,5)
FALL ON HARD TIMES — FALL (autumn) ON (regarding) HARD (leaves, i.e. hard copy?) TIMES (newspaper)

20

Pretty much specially geared to stay within single digit (2,1,6)
TO A DEGREE — anagram (specially) of GEARED inside TOE (single digit)

22

Strong point in favour of time limits (5)
FORTE — FOR (in favour of) TE (outside letters of time)

24

Burning issue's first seen in the form of cactus (7)
CAUSTIC — I (first letter of issue) inside anagram (the form of) CACTUS

26

Benefit cut yobbo put money on (4,3)
LAID OUT — AID (benefit) inside LOUT (yobbo)

27

Broadcast alert in time (5)
LATER — anagram (broadcast) of ALERT

28

Row of strikers, perhaps, get the point of a gag (9)
PUNCHLINE — cryptic def.

Down

1

Motorway is leading to monkey business (8)
MISCHIEF — M (motorway) IS CHIEF (leading)

2

Fly to centre of Alabama via Tennessee (6)
AVIATE — hidden in alabamA VIA TEnnessee

3

Men in store serve soup (10)
MINESTRONE — anagram (serve) of MEN IN STORE

4

Do well, like some meal? (8)
FLOURISH — cryptic def.

5

Dropped off a skinhead and picked up skin (6)
ASLEEP — A S (first letter of skin) reversal (picked up) of PEEL (skin)

6

Turn on edge and talk in slang (4)
CANT — double def.

7

Dunce's cap is most revealing form of wishful thinking (8)
ESCAPISM — hidden in duncESCAP IS Most

8

Pretty ordinary newspaper quotation (6)
RAGTAG — RAG (newspaper) TAG (quotation)

15

Behind closed doors and beyond compare (3,2,5)
OUT OF SIGHT — double def., cryptic def.

17

Make overtures and tape loud piece of work (4,2,2)
LEAD UP TO — anagram (piece of work) of TAPE LOUD

18

Wine and cheese topped gin cocktail (8)
RIESLING — bRIE (cheese, without first letter) SLING (gin cocktail)

19

Contained fire in outhouse (8)
SHEATHED — HEAT (fire) inside SHED (outhouse)

20

Instant, endless glee? (6)
TICKLE — TICK (instant) LE (glee without outside letters), &lit

21

Fixed price factored in energy content of ingredients (6)
RECIPE — anagram (fixed) of PRICE with E (energy) inside

23

Black bird that is greenhorn (6)
ROOKIE — ROOK (black bird) IE (that is)

25

Dub the Proms just at intervals (4)
TERM — odd letters in ThE pRoMs