Umbrella spokes (4)
I believe the answer is:
ribs
'umbrella spokes' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ribs that I've seen before include "Bones in chest, may be floating" , "Arched bones in the upper body" , "Curved bones around the chest" , "Pairs of curved bones" , "Makes fun of - bones" .)