No 9659, Monday, 12 Oct 09, Gridman

ACROSS
 1 - Fellow to do nothing to stomach Mr. Do-All (8) - FAC{TO}{TUM} Not clear on the relation between FAC and Fellow (Addendum - {F}{ACT}{O}{TUM} - Thanks to Jotter, see comments below)
 6 - Man of substances? (4) - NARC [CD]
 9 - Walk with Sikkim’s leading cave-dweller (6) - {S}TROLL
10 - Is compatible with landowners, we hear (7) - SQUARES(~squires) Squires doesn't sound like Squares
13 - Odd man going round clubs collecting perfume, reportedly (9) - E{CCENT(~scent)}RIC (Correction to Anno E{C}{CENT(~scent)}RIC)
14 - One who goes to court? (5) - WOOER [CD]
15 - Always chop head off (4) - (-s)EVER
16 - Hinting at fashionable sex appeal corning back on union (10) - {IN}{TI<-}{MATING} HAH! nailed the IT sex Appeal connection this time
19 - Take your time for solving this! (4,4,2) - EASY DOES IT [E]
21 - Women recalling a number endlessly (4) - (-n)EVES<- )
24 - Excuse one after ball-out (5) - ALIB*{I}
25 - Copy doctor and learner in spiritualistic session (9) - SE{MB}{L}ANCE
26 - Excite one northern female with exotic meal (7) - {I}{N}{F}LAME*
27 - One who may give you fits (6) - TAILOR [CD]
28 - A leader of hobos ousted from ravine, without legal force (4) - NULL(-ah)
29 - Run smoothly with one cook in overt operation (4,4) - T{I}{CK} OVER*
DOWN
 2 - In case a game batters each… (7) - {A}{TT}ACHE*
 3 - Head of tribals is lustful and troublesome (6) - {T}HORNY
 4 - Variation in understanding? (9) - TOLERANCE [E]
 5 - The food of love to a Shakespearean (5) - MUSIC [E]
 7 - This kind of reasoning is from cause to effect (1,6) - A PRIORI [E] A new word for me and had to be googled
 8 - What a trader likes to hear ticking (4,8) - CASH REGISTER [CD]
11 - Dirty pun about cunning RAW to unfold (6) - UN{WRA*}P*
12 - Worsening of the French offspring (12) - {DE}{GENERATION}
17 - Scholar in barmy surroundings following style of the language (9) - IDIO{MA}TIC
18 - Journalist to conquer a woman (6) - {ED}{WIN}{A}
20 - Expert to second king being bad about unending fun (7) - {S}{K}{IL{FU(-n)}L}
22 - Windy month? (7) - VENTOSE [E] Anotehr new word for me had to Google search this
23 - Current on Nile controlled (2,4) - EL NINO*
25 - Small U.S. coin gives inkling (5) - {S}CENT

GRID