Splits housing costs (5)
I believe the answer is:
rents
I believe this is a double definition.
'splits' is the first definition.
('rent' can be a synonym of 'split')
'costs' is the second definition.
(rent is a kind of cost)
'housing' acts as a link.
(Other definitions for rents that I've seen before include "tears" , "Leases" , "Hires" .)