No 11947, Monday 06 Mar 2017, Anon

Rather nice one from Anon.. didnt take too long to fill the grid and most parse
Sess - short form for sensemilla is a new term for me.. apparently Jamaican origin..
Ceratin is a new spelling ...only familiar with the K version ! the device used in this is a bit unusual..
Nice to see a Turing reference.. hope all remember and have seen The Imitiation Game ! The movie also has quite an intriguing music score.. heres a link to enjoy!
https://www.youtube.com/watch?v=hgupQA0bH-s


ACROSS

1 Advisors cheat ruler with empty treatises (11) CONSULTANTS (CON)(SULTAN)(TreatiseS)

9 Missing source of fuel, head scout lights (7) IGNITES (-L)IGNITE(Scout)

10 Escape from Spanish ambush coming back (6) DEPART (DE)(TRAP)<==

11 In revolt, hide around Lutyens' first city (5) DELHI (Lutyens) in (HIDE)*

12 Confident returning Territorial Army has protein (7) CERATIN CER(TA)<==IN

15 Sparse part of disaster area (4) RARE (T)

16 Impotence of great piper unnatural (5,5) PAPER TIGER  (GREAT PIPER)*

18 Navy impresses with plans (10) BLUEPRINTS (BLUE)(PRINTS)

20 Promote a wager (4) ABET (A)(BET)

23 Tipsy rani sat with Russian queen (7) TSARINA (RANI SAT)*

24 Mysterious oriental in front of lake (5) EERIE (E)(ERIE)

26 Fixed desks end to end (6) STABLE  (+S)TABLE(-S)

27 Joy, envy oddly removed from promotion (7) ELATION EL(-EnVy)ATION

28 Trendy valet destroyed deliberately (11) ADVERTENTLY (TRENDY VALET)*

DOWN

2 Publicly available suit, dress (6) OUTFIT (OUT)(FIT)

3 Tax, we hear, for weed (4) SESS ~ CESS

4 Houses weird gent models (10) LODGEMENTS (GENT MODELS)*

5 Snake stops on bituminous substances (8) ASPHALTS (ASP)(HALTS)

6 Code breaker circles new junction (7) TURNING N in TURING

7 Bird claws injured crustaceans (4,5) WILD CRABS (BIRD CLAWS)*

8 Fisherman’s point of view is right (6) ANGLER (ANGLE)(R)

13 Defamation of man’s associate, valets initially traumatising (10) MALIGNMENT (M)(ALIGN)(MEN)(Traumatising)

14 People of African country manipulate retainers (9) ERITREANS (RETAINERS)*

17 Functional but confused British parolee (7) OPERABLE (B + PAROLEE)*

19 Not having been satisfied, moved without last wife (7) UNSATED {UNS(-E)ATED}

21 Limousine in German city (6) BERLIN (DD)

22 Remove last feature (6) DETAIL (DE)(TAIL)

25 Labourer’s unreliable? Nope! (4) PEON (NOPE)*

GRID

Legend : Definition, Solution, Letters in word play, Indicators (of all sorts)