Umbrella parts (4)
I believe the answer is:
ribs
'umbrella parts' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ribs that I've seen before include "Chest bones, tasty when spare" , "Arched bones in the upper body" , "Spurs?" , "Arched bones extending from the spine" , "Is making fun of" .)