Agree to have trickster posted (7)

I believe the answer is:

consent

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'agree to' is the definition.
(I've seen this in another clue)

'trickster posted' is the wordplay.
'trickster' becomes 'con' (I am not sure about this - if you are sure you should believe this answer much more).
'posted' becomes 'sent' ('send' can be a synonym of 'post').
'con'+'sent'='CONSENT'

'have' is the link.

Can you help me to learn more?

(Other definitions for consent that I've seen before include "Say yes to something" , "Give approval" , "Agree or comply" , "Concur" , "Agree(ment)" .)

I've seen this clue in the Sydney Morning Herald.

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