No 2559, Sunday 22 Nov 09

Another tough one today, I hate CW’s with names, 11A and 2D elude me.
ACROSS
1 - 150 inside listening intently, mostly, for a signal that danger is over (3, 5) – ALL {CL}EAR(-s)
5 - Short chap with girl in Alpine lake (6) – {GEN(-t)}{EVA}
10 - Fir cone producer? (7) – CONIFER* Nice clue
11 - Duncan lives with a girl? (7) – I?A?O?A (Addendum - {IS}{A}{DORA} - See comments section below)
12 - Bad-tempered lines about a non-drinker (5) – R{A}{TT}Y
13 - Poisonous plant bringing misery to eastern mine (9) – {HELL}{E}{BORE} Had to google this answer
14 - One helping to create IT solutions says test's mainly useless without one (7, 7) – SYSTEMS ANALYST(-i)*
17 - A patron of the arts in Brazil - courage, I suspect, is required (8, 6) – LUCREZIA BORGIA* Had to google search this also
21 - Sensible type of examination (9) – PRACTICAL [DD]
23 - Good beer poured out for diver (5) – {G}REBE*
24 - Toy dog barking during brief march (3, 4) – RA{G DO*}LL(-y)
25 - Bewilder small number - nine, initially, at least (7) – {NO}{N}{PLUS} What's the link between PLUS and at least
26 - Tear after dad leaves mum? (6) – {PA}{RENT}
27 - Most dangerous point on mountain (8) – {S}EVEREST
DOWN
1 - A cello's top string creates harmony (6) – {A}{C}{CORD}
2 - Archbishop shot actress (7) – L?N?T?Y (Addendum - {LANG}{TRY} - See comments section below)
3 - A female getting in baby's things in general (9) – L{A}{F}AYETTE G of general should have been in capitals
4 - Famous American patriarch getting city's support (7, 7) – {ABRAHAM} {LINCOLN}
6 - To delete facility presses R (5) – E{R}ASE
7 - A financial saving made by small company spreading money about (7) – E{CO}NOMY*
8 - In the morning a soak needs to drink (8) – {AM}{A}{RET}{TO}
9 - Mobile military unit (medical) fuel ban affected (5, 9) – FIELD AMBULANCE* Medical on double duty
15 - Turn up in island church showing haughtiness (9) – {ARR{OG<-}AN}{CE} Answer is guesswork from the crossings. Annotation reverse engineered after googling
16 - Tripe, cold piece friend served up (8) – {C}{LAP<-}{TRAP<-} )
18 - Mistake made by clubs over former Ryder Cup captain (7) – {C}LANGER
19 - I hint about English bishop, a pale colour (3-4) – {I}{C{E} {B}LUE}
20 - Rich group of travellers in black kit (3, 3) – {JET} {SET}
22 - After short time, warning device becomes a source of irritation (5) – {T}{HORN}

GRID