Cryptic crossword No 3,888

Across

1. International relief agency promoting "women power" softly in Grand Opening (10)
2. Like an apple? Eat posh tartlet's crust - somehow close but not a winner (6,2,3,4)
3. Concern about including tip of aloe plant (6)
4. One grain nurtures fellow left at sea (6)
5. Occurrence regularly seen in picnic: wild peanut (8)
6. Hoodlum unwound (too much in retrospect) with joke or tricky problem (5,3,2,5)
7. Itch from Euphorbia, shedding sap externally (4)
8. Worn out, pine perhaps for Mackintosh's sweet old partner (8)
9. 99 conifers, potentially, or 101 (4)
10. Gluten intolerant and bucking the trend? (7,3,5)
11. Bananas run out, Ned sent on thorough search, leaving this (2,5,8)
12. Supervision of single person takes a long time; multiple people, little time (10)

Down

1. Strange amber tinge after removing head of Brussels Sprout (9)
2. Extract from berry de rigueur for certain cup, of course (5)
3. Core component of both ear tincture and Quiche Artichaut (5)
4. Weed with tops of thorns, highly irritating spikes, treacherous lacerating edges (7)
5. South American acorn, cooked with pear buds after shucking (9)
6. Old Romanian seed sent as a hybrid... (7)
7. ...grape seed with introduction of nitric oxide (5)
8. Disliked tree on Uruguayan borders bearing central ingredient of flautas (9)
9. Herpetologist went back carrying amphibians (5)
10. Common cleaning agent is mostly fruit peel, soy kernel and carbon, stored in glasses (7)
11. The leaders of Rush and Supergrass assembled in killer band (9)
12. Expert on canvas weaving appreciates tropical undergrowth, primarily, without leaves (7)
13. Issue with ear of corn: steaming takes bloody ages, firstly; nasty, secondarily (7)
14. Queen leaves chestnut in middle of veggies, banging on the bean (7)