Getting fine: villain at last going straight? (9)
I believe the answer is:
narrowing
'getting fine' is the definition.
(I've seen this before)
'villain at last going straight?' is the wordplay.
'at last' says to take the final letters.
'going straight?' becomes 'arrowing' (going straight as an arrow).
The final letter of 'villain' is 'n'.
'n'+'arrowing'='NARROWING'
(Other definitions for narrowing that I've seen before include "Getting fine" , "Becoming less wide" .)