It's paid by a tenant (4)
I believe the answer is:
rent
'it's paid by a tenant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rent that I've seen before include "Payment for lodging etc" , "breach" , "Payment for lodgings? that's torn it" , "Tenant's fee" , "Landlord's due - that's torn it" .)