1: Nits are possibly more unpleasant (7)
5: What's left when you burn the tree (3)
6: Smudge reams of misprints (5)
8: Mild expletive for a sea-faring people? (9)
9: Content little rest for the painter (5)
10: Man, what an avant-garde US artist! (3)
11: Stomach is disturbed, bad sign (7)