Cryptic crossword No 918

Across

1. Ultimately conceive plan to smuggle gold out of Cuba (three words) (7)
2. Agitate old bird visiting vet (7)
3. A musician's right to replace note - they're used to drones (8)
4. Belted out tune in turn (6)
5. UK's inspired by one (often black) revolutionary style of theatre (6)
6. Priest just after quarrels with some bishops (8)
7. Variety of citrus fruit lacking rind (4)
8. Earl attends grand endless revel to feast (4)
9. Attitude of those close to the front (4)
10. Knocked back a drink in the end and nearly plummeted (4)
11. Bird's sleeping area with nested egg (4)
12. First lady removing top takes nudes regularly - they'll make money (4)
13. Entering in vessel around 4 (8)
14. Strenuous task at home installing last piece of furniture (two words) (6)
15. Guard is held tight (6)
16. Clippings from both sides of stories surrounding trial (8)
17. Word describing the boring hole at back of house (7)
18. Snippet of French performance (7)

Down

1. Educational establishment that's opportunistic to some extent (3)
2. Fourteen francs spent travelling on the way (two words) (7)
3. Cooks headless fish (7)
4. Member of triad is described by short tape and letter from abroad (6)
5. Length of Spooner's poem of the century? (7)
6. Witch devours their food sloppily (four words) (11)
7. Pure prowess in action? (11)
8. Shout from captain - sailor hops in and out (two words) (11)
9. In the morning, adult aquatic carnivore returned (7)
10. Fried dish a drunkard's thrown up having eaten small amount (7)
11. Conceited person, say, is consumed by too much (7)
12. Screen problem (6)
13. Turn up after governor evacuated (3)