Celibate day before the weekend (4)
I believe the answer is:
monk
'celibate' is the definition.
(thesaurus)
'day before the weekend' is the wordplay.
'day' becomes 'mon' (abbreviation for Monday).
'before' is a charade indicator (letters next to each other).
'the weekend' becomes 'k' (I've seen this in other clues).
'mon'+'k'='MONK'
(Other definitions for monk that I've seen before include "Male member of religious order" , "Member of a religious community" , "Man in a religious order" , "Cloistered brother" , "One in a religious order" .)