Felon conveyed agreement (7)
I believe the answer is:
consent
'agreement' is the definition.
(consent is a kind of agreement)
'felon conveyed' is the wordplay.
'felon' becomes 'con' (abbreviation for 'convict').
'conveyed' becomes 'sent' (convey can mean to send or transport).
'con'+'sent'='CONSENT'
(Other definitions for consent that I've seen before include "Agree (to do something)" , "Give permission for something" , "authorisation" , "Give approval" , "Say yes to something" .)