Cryptic crossword No 3,777

Across

1. Pal briefly occupying unknown space, greeting initially shady medium for meditative practice (3,8)
2. Couple chasing me with legendary Pokémon (6)
3. Drink very loudly on college square with no degree (5)
4. Algerian music style Croatia regularly sampled (3)
5. Due to current volcano expelling its contents, left professor's aide in charge (7)
6. Be more ignorant, dropping set at first, following score for old Bahamian tennis ace (4,7)
7. One suppressing start of rebellion after what Frenchman said (7)
8. I'll give up oxygen for good source of protein (3)
9. Trouble opening returned copy - Italian's first opera about clowns (9)
10. Appealing voided experiment, pharmaceutical stocks took a nosedive (9)
11. Pilgrimage of Jack and Juliett beyond heart of Sahara (4)
12. Moving away from internet search engine that suppresses women (6)
13. Select some galette as your piece of cake (4)
14. Times article first to tout fashionable exercises for Socrates' ball-and-chain? (9)
15. Despite my best efforts, essay remains unfinished one month before June (3,2,1,3)
16. Inspect a long concealed claw (5)

Down

1. Pair of former lovers separated by maiden after originally tasting southwestern fare? (3-3)
2. Old-fashioned doctor ditches Charlie for ecstasy and half of valium (8)
3. Stifles flow of concerning fruit (6)
4. "This stinks" - beginning of review on The Fifth Element (5)
5. Component of toilet tank is aloft loosely, hollow, with cap of vinyl inside (5,5)
6. Wife is entering race? That's unexpected (5)
7. Fully prepared learner entered least disorganized (3,3)
8. Ladies perhaps with quiet kink? (4)
9. One in gross rage, furious! (9)
10. Consumed by anxiety, compose endlessly from organ (10)
11. Woman touring Britain on holiday (8)
12. After tea, average artist starting to look for thick brush (9)
13. Judge interrupting referendum, condemning liberal to removal by force (8)
14. Starbuck's shipmate docked Victoria, perhaps on half-broken pier, for example (8)
15. With carbonation, case of lemonade to fail (6)
16. Knives from certain Africans slashing head (4)