Sailor without sin, but roguish (3)
I believe the answer is:
bad
'roguish' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
'sailor without sin' is the wordplay.
'sailor' becomes 'sinbad' (I've seen this before).
'without' is a deletion indicator.
'sinbad' with 'sin' removed is 'BAD'.
'but' is the link.
Can you help me to learn more?
(Other definitions for bad that I've seen before include "SECOND HALF OF 16" , "Rotten, evil" , "not healthy" , "Substandard" , "Ill" .)