... and approve when posted (6)

I believe the answer is:

assent

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'and approve' is the definition.
I can't tell whether this definition defines the answer.

'when posted' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'posted' becomes 'sent' ('send' can be a synonym of 'post').
'as'+'sent'='ASSENT'

Can you help me to learn more?

(Other definitions for assent that I've seen before include "Acquiescence" , "Official sanction" , "Give the thumbs-up" , "Express approval or agreement" , "Agreement or concurrence" .)

I've seen this clue in The Telegraph.

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