Announcement about tenancy agreement (7)
I believe the answer is:
release
'announcement' is the definition.
(release is a kind of announcement)
'about tenancy agreement' is the wordplay.
'about' becomes 're' (regarding).
'tenancy agreement' becomes 'lease' (I've seen this before).
're'+'lease'='RELEASE'
(Other definitions for release that I've seen before include "record" , "Set free - publish" , "Let go" , "Issue" , "loose" .)