Dirty? Not me! (6)
I believe the answer is:
impure
'dirty?' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for impure that I've seen before include "Unclean" , "Lewd" , "Tainted, not chaste" , "Unrefined" , "Defiled" .)