Cryptic crossword No 3,841

Across

1. Sends message about subtle, not loud artworks (9)
2. Supporters rejecting new Roblox horror game (5)
3. Commonly decimal (5)
4. German hero, e.g. is tragically cooked (9)
5. Design leader of the factory (5)
6. Confused: sex pose or means of reproduction? (9)
7. Joins group, finally dividing portions (7)
8. Cadillac on ice, somewhat short (7)
9. Direct back and forth (5)
10. Diet burns this, ultimately (3)
11. Study drugs, maybe (5)
12. Mutant rat's leg is biggest (7)
13. Achieve A grade (7)
14. Oil expert becomes extortionist (9)
15. Reversing international taxi near American counters (5)

Down

1. Ordinal from castle that's extremely tough (8)
2. Woman supporter event featuring skirt (8)
3. Heads to some island daily, enjoying party (4)
4. Using me, control a high-end region (5,5)
5. After erection, urinated late (4)
6. A friend's audible shock (6)
7. They make dishes after beheading mammals (6)
8. Brochure displaying river's stream (8)
9. Smart to remove small instrument (4)
10. Declares complaints after battle (8)
11. Long for woman (4)
12. Band falls when cycling (5)
13. Cryptically declare it's removed (7,3)
14. Balance during Jump Rope (4)
15. Announced class contract (6)
16. Steamy bread in Ecuador (6)
17. Rock starting from second note (4)
18. Curry spot oddly shows vault (5)