Tenant and I study in peace (8)
I believe the answer is:
resident
'tenant' is the definition.
(thesaurus)
'i study in peace' is the wordplay.
'study' becomes 'den' (I've seen this before).
'in' is an insertion indicator.
'peace' becomes 'rest' (I've seen this in other clues).
'i'+'den'='iden'
'iden' placed into 'rest' is 'RESIDENT'.
'and' is the link.
(Other definitions for resident that I've seen before include "Hotel guest staying for a prolonged period" , "Inmate" , "Local" , "Inhabitant, occupant" , "Occupier" .)