Cryptic crossword No 3,649

Across

1. Lawyer's keeping liberal king back, gaining expertise (6)
2. Substance found in delicatessen ceiling (7)
3. Riddler cross after gym class outside hotel (6)
4. Start vault and skip event! (6,4)
5. Significant amount (7)
6. Assistant (via expert) adjusts potential gains (5,7)
7. Wizards walk with orcs, unbelievably (8)
8. Orinoco's hot? Sort of (3)
9. Prevent sociopath hiding affairs (6)
10. Half of sofa provides support (3)
11. Specialist gibberish in college, without chatter (12)
12. Mushroom market? (10)
13. ...minge: a naughty mystery! (6)
14. Confused after shaving firm, natural... (8)

Down

1. As the piper is playing, they write in stone (10)
2. For negative standing, it's actually positive! (6)
3. Examine part of Tuscany (4)
4. Tense crocodiles perhaps leaving river by shifting soft fibres (8)
5. Old racketeer is a woman? (4)
6. The first amendment describes what Mario does in audition? (4,6)
7. Dismal, bilious guru I left behind upset (10)
8. Underground worker heard bird (5)
9. Mistakes George for drummer Ringo: producer apologises at last (6)
10. Interrogate Pierre, asking "Who?" "Not known!" (4)
11. Bite in up-and-coming tabbouleh cafe? (4)
12. Warehouse erected to hide top of really large missiles (8)
13. One of fifty haka fans, alas, going half-naked? (6)
14. Loud, hackneyed singer (5)
15. Hunk starts to dance: overexcited ladies look on, panting (6)
16. Key transfers for Apollo and Artemis, perhaps? (10)