Pay to get clock, say, put up (5)
I believe the answer is:
remit
'pay' is the definition.
(I know that remit is a type of pay)
'clock say put up' is the wordplay.
'clock say' becomes 'timer' (something which times).
'put up' shows that the letters should be reversed in order.
'timer' back-to-front is 'REMIT'.
'to get' acts as a link.
(Other definitions for remit that I've seen before include "Brief - transfer" , "Job specification" , "Send - scope of one's duties" , "Transfer - area of authority" , "Send (money) by post" .)