Tenant's monthly payment (4)
I believe the answer is:
rent
'tenant's monthly payment' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rent that I've seen before include "Payment for lodgings? that's torn it" , "One due a letter" , "opening" , "Landlord's due - that's torn it" , "Split - lease" .)