Women's bad self-control (4)
I believe the answer is:
will
'self-control' is the definition.
(I've seen this before)
'women's bad' is the wordplay.
'women' becomes 'w'.
'bad' becomes 'ill' ('ill' can be similar in meaning to 'bad').
'w'+'ill'='WILL'
(Other definitions for will that I've seen before include "Shakespeare < 's intention to leave something" , "Resolve - testament" , "Intention; bequeath" , "Intend; document" , "Inclination" .)