4: What's left when you burn the tree (3)
6: Right, turn right to play with robot (3)
7: Fiber extracted from thistles (5)
8: Bird dog devouring bad lad (4,5)
11: Tender translator of runes (5)
13: Crew member is one in operating room (3)
15: Stayed only a moment at lewd Western with titillating beginning? Just the opposite! (5)