No 11770, Friday 05 Aug 2016, Anon

If 23A was PATTON we could have had a theme today

ACROSS
1   Change direction, crawl (6) SWITCH {S}{WITCH} Witch and Crawl?
4   Suggests restructuring firm from end to end (6) TABLES (-s)TABLE(+s)S
9   Idiots retreat from retreats (4) SPAS <=
10 Unnecessary painting outside institution’s boundary (10) EXTRAMURAL {EXTRA}{MURAL}
11 Mendicant has counterfeit odd Euro (6) FAKEER {FAKE}{EuRo}
12 Unorthodox deal with assistant in Australian city (8) ADELAIDE {DEAL*}{AIDE}
13 Bye! Go on a third adventure! Have a safe trip! (3,6) BON VOYAGE {BYE+GO+ON+A}{advEn...e}
15 General protects left leader with gun (5) RIFLE RIF{Le...r}E
16 Southern leader enters British art gallery to relish (5) TASTE {TA{So...n}TE}
18 Earl of Emsworth finally goes in carriages (9) CLARENCES {CLARENCE}{goeS}

22 Confused little giant let out by plaintiff (8) LITIGANT {lITTeL+GIANt}*
23 Patent weird footwear (6) PATTEN*
25 Ruins igloo by mistake? Shameful! (10) INGLORIOUS*
26 Head off to scrape the outer covering (4) RIND gRIND
27 Get away through the final shaft (6) ESCAPE {thE}{SCAPE}
28 Old-fashioned fight with a student (6) FEUDAL {FEUD}{A}{L}

DOWN
1   Porno actress loses heart, becomes singer (7) SOPRANO {PORNO+Ac...sS}*
2   Publication for children (5) ISSUE [DD]
3   Revolutionary adult left in time happily (7) CHEERLY {CHE}{EaRLY}
5   Nocturnal mammal gets into receding sea, fades away (6) ABATES {BAT} in {SEA<=}
6   Eulogy is a form of adulation (9) LAUDATION*
7   Investigation of returning boy for offence (7) SCANDAL {SCAN}{LAD<=}
8   Choking on short weird aunt’s oil (13) STRANGULATION {STRANGe}{AUNT+OIL}*
14 Bloody civil riot is destructive (9) VITRIOLIC*
17 Urge to throw fourth troublemaker out of the crowd (7) ADIENCE AuDIENCE
19 Answer by mail in ire, unusually (7) RIPOSTE {POST} in {IRE}*
20 Immortal bird trapped by spoilt ale (7) ETERNAL {TERN} in {ALE}*
21 Governor of South Africa returns to role (6) SATRAP {SA}{PART<=}
24 Hung up his boots with no hesitation; looking back, was exhausted (5) TIRED reTIRED

GRID