Poet's proposal (6)
I believe the answer is:
motion
I believe this is a double definition.
'poet's' is the first definition.
(former Poet Laureate Andrew Motion)
'proposal' is the second definition.
(motion is a kind of proposal)
(Other definitions for motion that I've seen before include "MP's proposal" , "Gesture; formal proposal" , "Moving - proposal" , "Movement or proposal" , "Old coin of Germany" .)