A French servant with large yen to be feminine? (7)
I believe the answer is:
unmanly
'be feminine?' is the definition.
(thesaurus)
'a french servant with large yen' is the wordplay.
'a french' becomes 'un' ('a' in French).
'servant' becomes 'man' (man is a kind of servant).
'with' says to put letters next to each other.
'large' becomes 'L' (eg in clothes sizes).
'yen' becomes 'y' (resembles the symbol for the currency of Japan).
'un'+'man'+'l'+'y'='UNMANLY'
'to' is the link.
(Other definitions for unmanly that I've seen before include "Not macho or courageous" , "Chicken" , "Effeminate" , "Not masculine" , "Feeble" .)