No 11962, Thursday 23 Mar 2017, Gridman

ACROSS
1   Collector's opening bid for small boxes (7) COFFERS {Co...r}{OFFER}{S}
5   Look back in the limits of Changanacherry — it's shiver-inducing (6) CREEPY {PEER<=} in {Ch...rY}
9   One in a section of church is ingenuous (5) NAIVE {NA{1}VE}
10 Reckless person's road speed recalibrated (9) DESPERADO*

11 Stiff boor broken with limited cudgel (7) ROBOTIC {BOOR}*{sTICk}
12 Nervous complaint following disparate sale of band (7) ELASTIC {SALE}*{TIC}
13 Greeting from rebel to the queen (5) CHEER {CHE}{ER}
14 Frequency of chic detectives taking a measure at the church (9) INCIDENCE {IN}{CID}{EN}{CE}
16 Burning desire of extreme party to take on a country (9) PYROMANIA {PartY}{ROMANIA}
19 A large number inside to move laterally (5) SIDLE {SID{L}E}
21 Held the will I cited as unauthorised (7) ILLICIT [T]
23 Backache arising out of you finally taking part in a difficult gambol (7) LUMBAGO {yoU} in {GAMBOL}*
24 Former patient admits editor after dismissing a model — it's appropriate (9) EXPEDIENT {EX}{P(-at+ed)EDIENT}
25 To South Arcot these young people get glossy fabrics (5) TEENS saTEENS
26 Old lover embracing girl is one who does a lot of walking (6) LEGMAN {LE{G}MAN}
27 I seem to be tossed about among Poles in retributive justice (7) NEMESIS {I+SEEM}* in {N}{S}

DOWN
1   Devices that don't help figures in birth register to go up (14) CONTRACEPTIVES [CD]
2   Rex — one in story — is easily broken (7) FRIABLE {F{R}{1}ABLE}
3   One who discards throws out head bouncer (7) EJECTOR rEJECTOR
4   Son cautioned about not having a pulling power (9) SEDUCTION {S}{CaUTIONED}*
5   Social class we're told to discard (5) CASTE (~cast)
6   Eve's first dream revolves around snatching lover's top stone (7) EMERALD {Eve}{MERA{Lo..r}D*}}

7   Pa on the refitted carriage (7) PHAETON*

8   Buildings set in a city for people to live in (8,6) CONCRETE HOUSES {CONCRETE} {HOUSES}
15 Fraud is almost slack in plan to nab a man (9) CHARLATAN {CHAR{LAx}T}{A}{N} Anno for N pending. Seems to be a mix-up in the clue See comments
17 Backsliding by careless leapers (7) RELAPSE*
18 Two men together produce paving material (7) MACADAM {MAC}{ADAM}
19 Review my post with first medico for a sign of illness (7) SYMPTOM {MY+POST}*{Me...o}
20 Cabinets for old-fashioned underwear? (7) DRAWERS [DD]
22 Bond's market ploy (3-2) TIE-IN [DD]

GRID