The agreement in the form forwarded (6)

I believe the answer is:

assent

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

'form forwarded' is the wordplay.
'form' becomes 'as' (I can't explain this - if you can you should believe this answer much more).
'forwarded' becomes 'sent' (I've seen this in other clues).
'as'+'sent'='ASSENT'

'in the' is the link.

Can you help me to learn more?

(Other definitions for assent that I've seen before include "Permit or approve" , "Accede, agree" , "Say yes" , "Acquiescence" , "Expression of agreement" .)

I've seen this clue in the Evening Standard.

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