Crossword Genius

Prisoner posted agreement (7)

Ross

I believe the answer is:

consent

'agreement' is the definition.
(consent is a kind of agreement)

'prisoner posted' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'posted' becomes 'sent' ('send' can be a synonym of 'post').
'con'+'sent'='CONSENT'

(Other definitions for consent that I've seen before include "Agree (to do something)" , "authorisation" , "Permission, agree" , "Say yes to something" , "Agree or comply" .)

I've seen this clue in The Mirror.
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