Recipient's exercises receiving positive vote (5)
I believe the answer is:
payee
'recipient's' is the definition.
(I've seen this before)
'exercises receiving positive vote' is the wordplay.
'exercises' becomes 'pe'.
'receiving' indicates putting letters inside.
'positive vote' becomes 'aye'.
'pe' going around 'aye' is 'PAYEE'.
(Other definitions for payee that I've seen before include "To whom cheque is written" , "Receiver of money" , "Person to whom money is made out" , "Beneficiary" , ".The one who gets the cheque" .)