Proposal prop? (4)
I believe the answer is:
knee
'proposal prop?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for knee that I've seen before include "Hinged joint" , "Leg hinge" , "may present problem to maid" , "Where the femur meets the tibia" , "One bent in genuflection" .)