Not bad with clothes on (6)
I believe the answer is:
decent
'not bad' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for decent that I've seen before include "Honourable or modest" , "Sufficient" , "Pretty good - not naked" , "Honest and modest" , "Upright" .)