Regularly offered payment (3)
I believe the answer is:
fee
'payment' is the definition.
(payment for a job)
'regularly offered' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'offered' are 'FEE'.
(Other definitions for fee that I've seen before include "price" , "Cost" , "Sum payable to, say, barrister" , "Money paid for professional services" , "Payment to a professional for services" .)