No 10412, Friday 16 Mar 12, Sankalak

ACROSS

1   - A beam so trained as to reveal simple organisms (7) - AMOEBAS*

5   - Leader of boys teased but boasted about it (7) - BRAGGED {B}{RAGGED}

9   - Being responsible is initially traumatic for a band member (15) - INSTRUMETALIST {INSTRUMENTAL}{IS}{T}

10 - Take for granted a part of what was Sumerian culture (6) - ASSUME [T]

11 - Make an enemy of a stranger with a note (8) - ALIENATE {ALIEN}{A}{TE}

13 - Agreement with antique disposition about love (8) - EQUATION {EQUATI{O}N*}

15 - Kith and kin (6) - FAMILY [E]

18 - Top cover for a party in almost beastly surroundings (6) - FEDORA {FE{DO}RAl}

19 - English resort, we hear, to cheer one up (8) -  BRIGHTON (~brighten) (Correction - BRIGHTEN (~brighton) - See comments of Sankalak below)

22 - Cruel act, concealing awful rot in a big town (8) - ATROCITY {A}{ROT*}CITY}

24 - Note to some students to mend their ways (6) - REFORM {RE}{FORM}

27 - Change of parts that could save a life (15) - TRANSPLANTATION [CD]

28 - Forced by fellow-student crossing East Coast Road the wrong way (7) - COERCED {CO-E{RCE<-}D}

29 - Go ahead with platoon leader, then go back (7) - PRECEDE {P}{RECEDE}

DOWN

1   - Create a stir, as might a soldier in a gallery (7) - AGITATE {A}{GI}{TATE}

2   - African group, one's refuge in wasteland (5) - OASIS {OAS}{1'S}

3   - Instrument, a rod to measure contained oxygen (9) - BAROMETER {BAR}{O}{METER}

4   - Wrestling for money and love (4) - SUMO {SUM}{O}

5   - Ornament with which to hit the French (6) - BANGLE {BANG}{LE}

6   - Plant found on a grand big road (5) - AGAVE {A}{G}{AVE}

7   - George Harrison was one (9) - GUITARIST [GK]

8   - Nervous? Uncertain? Try and hide somehow (7) - DITHERY*

12 - The weapon taken at the end of the concert (3) - BOW [DD]

14 - Promise a funeral organiser to lose last right (9) - UNDERTAKE UNDERTAKEr

16 - A collection put together of, for example, English ragtag assembly (9) - AGGREGATE {EG+E+RAGTAG}*

17 - A member among similar members (3) - ARM [T]

18 - Desperate French caper (7) - FRANTIC {FR}{ANTIC}

20 - Candidate getting a new omen — that is funny (7) - NOMINEE {N+OMEN+IE}*

21 - Unemotional detective inspectors return, accepting what is in fate (6) - STOLID {S{TOL}{ID}<-

23 - Measure of flow in copper over a little time (5) - CUSEC {CU}{SEC}

25 - A source of oil like nothing in existence (5) - OLIVE {O}{LIVE}

26 - Fasteners reversed and cut (4) - SNIP <-

LINK TO GRID