No 9749, Tuesday 26 Jan 10, Nita Jaggi

REPUBLIC DAY greetings to all. I will be publishing an interview with Shuchismita Upadhyay (Shuchi) the brain behind CROSSWORD UNCLUED later today, thought I would do it tomorrow as it may be a holiday for papers, which is not so.
13A has me stumped
ACROSS
 1  - Extremists regularly fear the new acts developed ingeniously in the beginning (8) - {F}{A}{N}{AT{I}CS}
 5  - Encourage the sailor to eat out in the afternoon (4) - {AB}{E(-a)T}
 9  - Small articles on sovereignty initially in the eastern vicinity of the capital city (8) - {S}{A}{RAJ}{E}{V}{O}
10 - Duration of a programme (6) - COURSE [DD]
12 - University that may offer independent education through correspondence (4) - OPEN [CD]
13 - Sound of which vehicle? (10) - ?R?T?S?I?M (Addendum - BROOMSTICK - See comments)
15 - Train Peter in to change the way the past is perceived (14) - INTERPRETATION*
17 - Take care to cut short an answer of one with limitless calibre (14) - (RESPONS(-e)}{I}{(-a)BILITY}
21 - Supplementary notice of the detailed validation does not have a sign (10) - {AD}DITIONAL(-a-v)*
22 - Sudama’s humble offering to the Lord! (4) - POHA [E] Poha is beaten rice in India
25 - Write-up again to see (6) - REVIEW [DD]
26 - Initially have a look right in the borders of Chile for the gas (8) - C{H}{LO}{R}{IN}E
27 - Said to look at the location (4) - SITE(~sight)
28 - Muslim leader is right in front of a gangster going back to the capital city (8) - {AGA}{RT}{LA<-} )
DOWN
 1  - Politician is out of the commotion in the merger (6) - (-con)FUSION
 2  - Look after the money when small change gets replaced by a note (5) - (-p+n)NURSE
 3  - The Spanish name for the Tagus river (4) - TAJO [E]
 4  - Hide the man finally in the car in Uttar Pradesh (5,2) - COVE{R} {UP} ?
 6  - They may be put up at fairs organised for publishers (10) - BOOKSTALLS [CD]
 7  - Special kind of person will start talking to the minister anyhow (9) - {T}ERMINIST*
 8  - Joint in the side of the wood (5) - ABEAM [DD] (Correction - STEAK - See comments)
11 - Animal spot (4) - STYE Is the only word that fits here Anno unknown (Correction MOLE [DD] - See comments)
14 - Behaviour is right for the workers in the warehouse (10) - DEPO{RT}{MEN}T
16 - Proceeded gingerly with ease after four plunges (9) - {NOSED}{IV}{ES}
18 - Black dust left out of the machines taken up (4) - S(-l)OOT <- )
19 - Friendly gesture in a dominant position (4,3) - BEAR HUG [DD]
20 - Hidden device from the public eye for security reasons (6) - CAMERA [CD]
21 - Kitchen garment is out in Paris stitched with the number upside down (5) - {APR(-is)*}{ON<-} )
23 - Language is the first option for the girl (5) - {O}{RIYA}
24 - Two pairs are on time (4) - FOUR [DD]

GRID