Cryptic crossword No 3,479

Across

1. Trade always includes this (4)
2. What killed Isadora Duncan? Automobile in bay city (5)
3. She buys online from European pharma company (6)
4. Get fat learner into junk? (5)
5. Heap full of very loud trash (6)
6. Blade part Snipes accepted at first with two hot characters fighting (8)
7. Leader of Radiohead’s into weird ethnic instrument (7)
8. Kent area initially subsidises offshore regions (4)
9. Hesitation after key change (5)
10. When cycling, rant and swear (4)
11. Quiet American fraud (4)
12. Dad rants about flag (8)
13. Ace quit oddly splashy spirits (6)
14. Scenes of gifted American in dinner jacket (8)
15. Smallest amounts of tungsten collided with sulphur (5)
16. Hiding second-rate, oddly effaced, quirky signage (7)
17. Beggar has no way to eat ravioli for starters (6)
18. Crazy about things to do with pool balls before & during game (8)

Down

1. Swear to catch drip with smooth hand (7)
2. Sensitive timer’s beginning on aircon, followed by rising air in Berlin (7)
3. Red selection from Muscat? Aw, baby! (7)
4. What Brazilian mayor might do, given time to go crazy (3,4)
5. Terrible Israeli composer (7)
6. Look out for the Germans! (7)
7. Drink raised in limousine for Sid or Julius, say (6)
8. A bit’s missing from sousaphone container (3)
9. Some tosser pseudishly raised a drink (8)
10. Catch clothing store leaving Twitter (3)
11. Be slow to turn bends (6)
12. New tool eaten by one extra-large animal (7)
13. Authorise extract of decent IT lessons (7)
14. Celeb, very hollow-eyed, didn’t eat (7)
15. Insult detectives (3)
16. Hit play (not on the Fringe) (3)
17. Horizontal scar bro’s sporting (8)