Payment subsequently withdrawn, including last part of commission (6)
I believe the answer is:
rental
'payment' is the definition.
(I've seen this before)
'subsequently withdrawn including last part of commission' is the wordplay.
'subsequently' becomes 'later' (I've seen this before).
'withdrawn' is a reversal indicator.
'including' indicates putting letters inside.
'last part of' says to take the final letters.
The last letter of 'commission' is 'n'.
'later' backwards is 'retal'.
'retal' enclosing 'n' is 'RENTAL'.
(Other definitions for rental that I've seen before include "Learnt (anag) -- lease" , "Tenant's payment" , "Money paid for hire" , "4 across (anag)" , "Payment for use -- antler (anag)" .)