Concerning contract being free (7)
I believe the answer is:
release
'being free' is the definition.
(to release someone is to free them)
'concerning contract' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'contract' becomes 'lease' (lease is a kind of contract).
're'+'lease'='RELEASE'
(Other definitions for release that I've seen before include "Issue" , "Let go" , "Authorise publication" , "Possibly film" , "Set free - publish" .)