No 10003, Friday 19 Nov 10, Gridman

7th one from Gridman. I suppose 9999 was a special one that's why.
ACROSS
1   - One new furniture, right to that extent (2,2,3) - {I}{N} {SO FA}{R}
5   - Sulk secretively around a fringe of Assamese capital (6) - {LUS{A}K*}{A}
9   - Fellow in Yale compound that's verdant (5) - {LEA{F}Y*}
10 - Stony, increasingly lost in mountain and sea (9) - {M}{AR{MORE}AL}
11 - Two vehicles on either side of a third (7) - {CAR}{A}{VAN}
12 - Delicate, chummy, yet partially astringent (7) - CATECHU [T]
13 - Authority — putting daughter in it would be cosmetic (5) - POWdER
14 - Torn photo sent there and then (2,3,4) - ON THE SPOT*
16 - One to emulate Oriental style in list (4,5) - {ROL{E} {MODE}L}

SEE THIS CARTOON

19 - Girl gets almost excited in America (5) - {IDA}{HOt}
21 - Group with no members, in math (4,3) - NULL SET [E]

23 - Wine makes Royal Highness sport peculiar shine (7) - {RH}{ENISH*}
24 - Off-the-cuff admission by early arrival to union leader (9) - {I'M}{PROMPT}{U}
25 - Little Tom so didn't finish degree (5) - THUMB (Addendum - {THUs}{MB} - See comments)

26 - For a theologian, half-supper makes sense (4,2) - {A}{DD}{S UPper}

SEE THIS CARTOON

27 - Rigorous detectives return nabbing ruffled star (7) - {D{RAST*}IC<-}
DOWN
1   - Oral inspection carried out in the place of a father or mother (2,4,8) - IN LOCO PARENTIS*
2   - Criticises rising dispute over flier (7) - {SPAR<-}{ROW}
3   - Look down on a road crossing? (7) - {FLY}{OVER}
4   - Via? (5,4) - ROMAN ROAD [E]
5   - Family rich with canned music (5) - LYRIC [T]
6   - Garment that doesn't come full-length (7) - SHORTIE [CD]
7   - Pat and Ella together would make it (7) - KNEECAP [CD]
8   - I curb school PTA out of a dread for confined spaces (14) - CLAUSTROPHOBIA* (Correction - CLAUSTROPHOBIC*)

15 - If you do, you try to change others' opinions (4,5) - TALK ROUND [CD]
17 - Fifty idly scattered around father's perch in pond (4,3) - {L}{ILY {PA}D*}

18 - Woman going round animal acts wrongly (7) - {MIS{DOE}S}
19 - At home, terribly irate, showing sluggishness (7) - {IN}{ERTIA}
20 - Quail to determine an exact divisor (7) - ALIQUOT* First time I'm hearing this word
22 - Convertible driver's option to place at an angle to the deck (3,2) - TOP UP [CD]

GRID