No 11969, Friday 31 Mar 2017, Arden

ACROSS
1   It's conical shape, in brief (7) LACONIC*
5   Yahoo may commit fratricide (7) BUMPKIN {BUMP}{KIN}
9   Leave us, take a left hand batsman... (5) GOWER {GO}{WE}{R} R from?  - See comments

10 ...she writes to God, uses a ground cover (9) AUTHORESS {USES+A}* over {THOR}
11 Flower — perhaps an old lotus on land... (9) CARNATION {CAR}{NATION} Lotus Cars are still there

12 ...old painting's back too (5) EXTRA {EX}{ART<=}
13 Slug or fight, Bravo's not tense (4) BIFF {B}{tIFF} As per wording of clue this becomes IFFB
15 Feeling lazy at home, work's advanced (8) INDOLENT {IN}{DO}{LENT}
18 'Greek Curse' — nice composition (8) HELLENIC {HELL}{NICE}*
19 A new way to decline (4) WANE*
22 Harry gets female in sack (5) RIFLE {RI{F}LE}
24 Disabled pigs grunt miserably (9) HAMSTRUNG {HAMS}{GRUNT}*
26 Girl's drunk, taking vehicle for a romp (9) GALLIVANT {GAL}{LI{VAN}T}
27 Woody Keaton, has no time off (5) OAKEN KEAtON*
28 Centrepiece kept exposed, turns green (7) EPERGNE {kEPt}{GREEN}*

29 Call the stupid fellow in, he is all thumbs (7) DIGITAL {DIG IT}{AL}

DOWN
1   On fast depleting power, what is left? (6) LEGACY {LEG}{pACY}
2   Lower card that is played, indicates weakness (9) COWARDICE {COW}{CARD+IE}*
3   'Reject Rumba' — odd name for an opera (5) NORMA {NO}{RuMbA}
4   Subject of scam — one goes into dubious power sharing mode (9) COALITION {COAL}{IT{1}ON*}
5   Stick to orders, keep scoring runs (5) BATON {BAT}{ON}
6   Prediction on computing power — maybe same or low (6,3) MOORE'S LAW*
7   Bent down, and boom! — left for Thailand (5) KNELT KNEL(-l+t)T
8   Place to be in when assaulted (6) NASSAU [T]
14 Force changing, showing indecision (9) FALTERING {F}{ALTERING}
16 Destroyed old houses — rodents on the rise (9) DECIMATED {D{MICE<=}ATED}
17 One carrying food in bag to an island resort (9) NANTUCKET {N{AN}{TUCK}ET}
20 Accent is on the shoe (6) BROGUE [DD]
21 Angola perhaps on death throes (6) AGONAL* New word for me
23 Drops said to be spurious (5) FALSE (~falls)
24 By the way, the fellow's shy (5) HEAVE {HE}{AVE}
25 Strip it, have a change of heart (5) THONG TH(-i+o)ONG

GRID