Longing for women, if lust unbridled (7)
I believe the answer is:
wistful
'longing for' is the definition.
(wistfulness is a feeling of longing)
'women if lust unbridled' is the wordplay.
'women' becomes 'w'.
'unbridled' indicates an anagram (letters are unrestrained or unbridled).
'if'+'lust'='iflust'
'iflust' with letters rearranged gives 'istful'.
'w'+'istful'='WISTFUL'
(Other definitions for wistful that I've seen before include "Melancholy" , "Sadly pensive" , "Regretfully longing" , "(Of a smile) showing vague or regretful longing" , "Disconsolate" .)