Cryptic crossword No 849

Across

1. Inwardly hollow - steal to fill the gap wrongly (15)
2. Clan puts together dish with skill (7)
3. Caustic criticism for six musicians and student (7)
4. Horse haemorrhaged, according to Spooner, from pimple (9)
5. Little credit with university mark book (5)
6. Party game leading to one down? (4,3,6)
7. After some research last month, Bob proceeds (7)
8. Change last word, adding note (5)
9. I hum E upon broken instrument (9)
10. Guarantee concert is English (7)
11. Ferocious South American produces little laugh following Cornwall's saint (7)
12. Small amount reportedly leave farmers in flipping loop (15)

Down

1. Finally, Charles is returning king - going around cross? (4)
2. Venture inside populated area (4)
3. Fancy not sleeping on call (8)
4. See 15a
5. Dealer's pride over drug-free transformation (8)
6. Attic wrecked over cold strategy (6)
7. Abiding rest (8)
8. Programme showing singer picked up on raised sub (8)
9. Lead characters in those ugly leotards is potential cause of mania (5)
10. Dampest shaken by the first of effects of flood (8)
11. I chose mingling with EU - this is cold storage! (8)
12. Perhaps iron or copper components (8)
13. Studio space for Matilda? (8)
14. Time with Ruth and Verity (5)
15. Recast Dr Evil? Nonsense! (6)
16. Ads for little dogs at the back of post office (3-3)
17. Stink if found to be in fascist group (4)
18. Well content to stab Lydia (4)