Monastery residents without sin? (7)
I believe the answer is:
novices
'monastery residents' is the definition.
(as in novice monks)
'without sin?' is the wordplay.
'without' becomes 'no'.
'sin?' becomes 'vices' (vices are sinful).
'no'+'vices'='NOVICES'
(Other definitions for novices that I've seen before include "Beginners; nuns" , "Neophytes" , "starters?" , "Converts" , "Beginners, who have not sinned?" .)