Ask, in French, about right nipple (7)
I believe the answer is:
entreat
'ask' is the definition.
(thesaurus)
'in french about right nipple' is the wordplay.
'in french' becomes 'en' ('en' can be French for 'in' e.g. en France).
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'nipple' becomes 'teat' ('teat' can be a synonym of 'nipple').
'r' inserted into 'teat' is 'treat'.
'en'+'treat'='ENTREAT'
(Other definitions for entreat that I've seen before include "petition" , "Beg earnestly, beseech" , "Ask (someone) anxiously" , "Ask (someone) earnestly" , "Beg earnestly, appeal" .)