Moving proposal (6)
I believe the answer is:
motion
I believe this is a double definition.
'moving' is the first definition.
(thesaurus)
'proposal' is the second definition.
(motion is a kind of proposal)
(Other definitions for motion that I've seen before include "Formal proposal for debate" , "Changing state, moving" , "Moving - resolution" , "inducing nausea in some travellers" , "Flow - proposal" .)