Cryptic crossword No 3,382

Across

1. Just a little discount supermarket I promoted in outskirts of Morley (6)
2. Switch over our set before final show from Ronnie Barker? (3)
3. Quiet long-term resident maintaining independence after morning booster (9)
4. Grease star exposed source of friction in review (3)
5. Husband distributing racy nude leads to uproar (3,3,3)
6. Strikingly beautiful figure perhaps jumping queues (10)
7. Half-heartedly swindle aristocrat (5)
8. Unruly pirates on a break (10)
9. See 8d
10. See 20d
11. Tense and confused as volunteer heads for exit (5,2,5)
12. Potent drink's psychedelic effect confronting the French (6)
13. Quantity of mackerel likely brought back predator (6)
14. Someone devastated by regular servings of warmed coke (5)
15. Where union official traditionally formalises alliances after march? (6)
16. Combined notes about migrating tribes striking east (6)

Down

1. Make last scream in audition before public (3,3)
2. Conflict circumvented by fellow cycling ahead (6)
3. Bloused genie possibly a result of head trauma? (6,6)
4. It echoes about, about, about, about, five beats at first (6)
5. Weep over coach’s resting place (5)
6. Sceptical outburst breaking social convention generates little damage (2,4)
7. Bandage darkens at intervals, finally stops (5)
8. See 14a
9. Rowdy lad brought up issue with personal hygiene (5)
10. Row of small dishes about to go on the counter (4)
11. Wheeled transport takes off (5)
12. Wife comes out of last wishes poorly (3)
13. King with a virtual assistant entertains queen in Indian language (8)
14. Outspoken line cook who's taken orders? (5)
15. Successfully do crack (4)
16. Cannabis legislation covers Santorini? (4)
17. Elements of unique temple architecture here? (4)
18. Low-cost protective measure that's trampled all over after being rolled out? (8)
19. Parisian street's various cheesy samples (6-7)
20. Naked femme fatale evoking strong feeling (3)