Movement’s formal proposal (6)
I believe the answer is:
motion
I believe this clue is a double definition.
'movement's' is the first definition.
(synonyms)
'formal proposal' is the second definition.
(I've seen this in another clue)
(Other definitions for motion that I've seen before include "Formal proposal for debate" , "Proposal for discussion or a vote" , "Old coin of Germany" , "MP's proposal" , "Moving - proposal" .)