No 2610, Sunday 21 Nov 10

Stumped by 1A, had to cheat to get the answer, not sure of the annos for 6 & 10A
ACROSS
1 - Unduly led astray by star for so long (6-3) –  {TOO}{DLE*}-{PIP}Had to google search this.
6 - Drank regularly round base (5) – DEPOT Anno pending (Addendum - DEPOT <- -See comments)
9 - It's more than likely this'll give you a good run for your money (4-2,9) – ODDS-ON FAVOURITE [CD]
10 - Sympathetic cheering (6) – GENIAL [DD]
11 - Knife fight about cash register with one pound missing (8) – {S{TILl}ETTO}

13 - Lie in bed, poorly, not fit enough to eat (8) – INEDIBLE*
14 - The pair answer a South African politician (5) – {BOTH}{A}
17 - Father embracing sapper, 22 (5) – {D{RE}AD}
18 - A setter barking round end of rose bushes (3,5) – {TEA TR{E}ES*}

20 - Spelunkers sheltering notice corpses (8) – {C{AD}AVERS}
22 - Troublesome child, last to admit mistake (6) – {T}{ERROR}
24 - Two articles about unseen spymaster in film (3,9,3) – {THE} {INVISIBLE} {MAN}
(Correction - {THE} {INVISIBLE} {M}{AN} - See comments)
25 - Poor performer spending time with teacher (5) - RABBIt
26 - Orchid exposed by peeress (5,4) – {NAKED} {LADY}

DOWN
1 - Right in grip of hard depression (6) – {T{R}OUGH}
2 - One restricted by guns regulation (9) – {ORD{I}NANCE}
3 - Vindaloo and rice prepared for a famous painter (8,2,5) – LEONARDO DA VINCI*
4 - Seabird's lost in gust (4) – PUFFin
5 - Pedestrianise, to make progress easier? (4,3,3) – PAVE THE WAY [CD]
6 - Ambiguous, like Sackville-West? (6-9) – DOUBLE-BARRELLED [CD] 
7 - Suggest a tip (5) – POINT [DD]
8 - Abstemious count after support (8) – {TEE}{TOTAL}
12 - A cleansing process alien to Serbians (10) – ABSTERSION* New word for me.
15 - Teacher confused about one mass, a peninsula (3,6) – {THE CR{I}{M}EA*}
16 - Teacher courted a disaster (8) – EDUCATOR*
19 - Alcoholic drink, make unknown (6) – {BRAND}{Y}
21 - Boring type starts to discuss weatherman's early evening broadcast (5) – {D}{W}{E}{E}{B}

23 - Cream plectrum? (4) – PICK [DD]

GRID