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ACROSS
1 Cut to screen commercial in show (6) PARADE {PAR{AD}E}
4 Badmouth India before person from Nicobar, say (8) ISLANDER {SLANDER}<=>{I}
9 Free suggestion to follow Engineers' society (6) RESCUE {CUE}<=>{RE}{S}
10 Noise picked up evens out in Bose surround units? (8) BRACKETS{Bo{RACKET}Se}
11 I represent a competitive private business (4,10) FREE ENTERPRISE {I+REPRESENT}* [RA]
13 Setter heard news - it's adapted for Observer! (3-7) EYE-WITNESS {(~i)EYE}{ITS+NEWS}*
14 Say books for quadruple American awards (4) EGOT {EG}{OT}
16 Basically cool and friendly eatery! (4) CAFE Acrostic &lit
18 On the level where Scrabble tiles may be played? (5-5) ABOVE-BOARD [DD]
21 These awardees are able, resolute and mostly extraordinary (5,9) NOBEL LAUREATES {ABLE+RESOLUTE+ANd}*
23 Checked and showered loudly at home (6,2) REINED IN {(~rained)REINED}{IN}
24 Shown regularly fairly in all belonging to a daughter or son (6) FILIAL {FaIrLy+In+AlL}
25 Black and white pieces of game in box including directions (5,3) CHESS SET {CHES{SSE}T}
26 Design an episode to show upset state (6) PENANG [T<=]
DOWN
1 Leave power boat (4) PARK {P}{ARK}
2 Store jam without lid (7) RESERVE pRESERVE
3 What's recommended for going concerns? (8) DIURETIC [GK]
5 Software hacking even scares end-user (6-5) SCREEN-SAVER {EVEN+SCARES+e...eR}*
6 Admit suitable crowds around conservative church (6) ACCEPT {A{C}{CE}PT}
8 Valued troops caught in rush (9) RESPECTED {RE{SPECT}ED}
12 Kind braves in a struggle to keep running (11) NONABRASIVE {BRAVES+IN+A}* over {ON}
15 Important to stand-up in honest president's case (8) ABLATIVE {AB{VITAL<=}E}
17 Very hot bar girls oddly in charge (7) FEBRILE {FE{BaR+gIrLs}E}
22 Jack's decline (4) FLAG [DD]
Reference List
Commercial = AD, India = I, Engineers = RE(Royal Engineers), Society = S, Books = OT(Old Testament), Directions = S,S,E, Power = P, Conservative = C, Church = CE, Cent = C, Area = A