To love a woman is good (4)
I believe the answer is:
okay
'is good' is the definition.
(thesaurus)
'to love a woman' is the wordplay.
'to love' becomes 'o' (love means zero in tennis).
'a woman' becomes 'kay' ().
'o'+'kay'='OKAY'
(Other definitions for okay that I've seen before include "Authorise" , "Permissible (colloq.)" , "Permissible; fairly good" , "Common jargon for yes, all right" , "Agreed!" .)