Occupy in monastic style (7)
I believe the answer is:
inhabit
'occupy' is the definition.
(synonyms)
'in monastic style' is the wordplay.
'monastic style' becomes 'habit' (I am not sure about this - if you are sure you should believe this answer much more).
'in'+'habit'='INHABIT'
Can you help me to learn more?
(Other definitions for inhabit that I've seen before include "Live in (a place)" , "Occupy - settle" , "Tenant" , "Dwell in" , "Live in, occupy" .)