Cryptic crossword No 3,991

Across

1. Show visible delight to start smoking (5,2)
2. Urges torture comes to a finish (8)
3. See 26d
4. At onset will install new garage in extension (4)
5. Could be used in a down clue? (5)
6. Brighton neighbour given a little luxury hut (5)
7. Devour bit of Wensleydale in pasty (7)
8. 6 in Hawaiian or Eurasian, for example (4)
9. Collar made from fine pelt from the East (4)
10. Unopened sore in the back of canine? Use this to wash it out (9)
11. Seduced and became less demure? (7)
12. Mendacious gossip about Tory leader taking drugs (9)
13. Shears off cross bracketing essentially retaining ship (8)
14. Revolting slug lying in parts (4)
15. Going round section of path gingerly in dark (5)

Down

1. Way to make bowl coming to be forgotten eventually (4,4)
2. Praises The Departed (9)
3. Supports introducing legislation initially blocking mirrored streets (6)
4. Offal curry gives you an unusual gait (8)
5. Embarrassed I ogled showcases; they're a vain pursuit (4,5,6)
6. See 1d
7. French for one on a rupee confusingly (8)
8. Start with birdbrain, vacant chutzpah (6)
9. Aberdonian boy is eccentric (4)
10. See 1d
11. Their bird has no end (5)
12. Regularly Brook lulled to run with curler (6)
13. Negligee garb hitherto only ultimately suited youth (5,3)
14. Flighty getaway girl is a flapper (4,7) (4,7)
15. First of younglings leaves nest to find great body of water (4)