Release without payment (4)
I believe the answer is:
free
I believe this clue is a double definition.
'release' is the first definition.
(synonyms)
'without payment' is the second definition.
(free of charge)
(Other definitions for free that I've seen before include "Not incurring charge" , "Liberated" , "unemployed" , "On the house" , "Gratis, for nothing" .)