1: In a way, suffer from stain all around us (7)
2: A French number that is Country or Jazz (9)
3: The final deep depression embraces the descriptive term (7)
4: 'Ransom'? Lame. Run 'Rocky I', 'II', 'III', etc. (5,8)
5: Did a boob resemble navel? (7)
6: Hate because sailor gets a head start in Oregon (5)
8: Awful din; ill effects were her own doing (4-9)
10: Flirted terribly, and on your example dated start-ups (5)
15: The spider is a natural at disguise (9)
16: Goes bad and accepts never-ending abuses of the system (5)
17: Spotted one delinquent leader after parole violation (7)
18: Jimmy hugs otherwise retiring rock 'n' roll legend (7)
19: Former spouse was a model, it's revealed (7)
21: Short time for the Irish (5)