Unpopular woman! Women gush (7)
I believe the answer is:
outflow
'gush' is the definition.
(thesaurus)
'unpopular woman women' is the wordplay.
'unpopular' becomes 'out' (similar in meaning).
'woman' becomes 'flo' ().
'women' becomes 'w' (standard abbreviation).
'out'+'flo'+'w'='OUTFLOW'
(Other definitions for outflow that I've seen before include "Amount of liquid moving away" , "Large amount transferred to another place" , "Tofu owl (anag.)" , "Liquid issuing from a place" , "Discharge" .)