Free to let again (7)
I believe the answer is:
release
This clue is a double definition.
'free' is the first definition.
(to release someone is to free them)
'let again' is the second definition.
('lease' can be a synonym for 'let' so perhaps 'release' is OK for 'let again')
'to' is the link.
(Other definitions for release that I've seen before include "put out" , "press announcement" , "Free from confinement" , "loose" , "Let go" .)