Hire in Brentford (4)
I believe the answer is:
rent
'hire' is the definition.
(I know that hire can be written as rent)
'in brentford' is the wordplay.
'in' says the answer is hidden in the clue.
'RENT' can be found hidden inside 'brentford'.
(Other definitions for rent that I've seen before include "Money to pay" , "Regular payment" , "Tenant's payment" , "One due a letter" , "Money for hire - that's torn it" .)