Charter again set free? (7)
I believe the answer is:
release
This clue is a double definition.
'charter again' is the first definition.
('lease' can be a synonym for 'charter' so perhaps 'release' is OK for 'charter again')
'set free?' is the second definition.
('release' can be a synonym of 'set free')
(Other definitions for release that I've seen before include "put out" , "record" , "loose" , "Possibly film" , "press announcement" .)