It's usually due on the first of the month
I believe the answer is:
rent
'it's usually due on the first of the month' 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 "It's paid by a tenant" , "Payment for house etc" , "Split - lease" , "Tear; lodger's payment" , "Lease - torn apart" .)