Proposal put forward as a gesture (6)
I believe the answer is:
motion
'proposal' is the definition.
(motion is a kind of proposal)
'forward as a gesture' is the wordplay.
I cannot quite understand how this works, but
'forward' could be 'on' and 'on' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'put' is the link.
Can you help me to learn more?
(Other definitions for motion that I've seen before include "Formal proposal for debate" , "Moving - proposal" , "Proposal for action" , "Old coin of Germany" , "Movement or proposal" .)