Live with a socially acceptable boyfriend (4)
I believe the answer is:
beau
'boyfriend' is the definition.
(synonyms)
'live with a socially acceptable' is the wordplay.
'live' becomes 'be' (synonyms).
'with' means one lot of letters go next to another.
'socially acceptable' becomes 'u'.
'be'+'a'+'u'='BEAU'
(Other definitions for beau that I've seen before include "Dandy - boyfriend" , "young man" , "One loving" , "An old boy friend like Brummel?" , "An old boy friend or dandy" .)