Pokes fun at (4)
I believe the answer is:
ribs
'pokes fun at' is the definition.
('rib' can be a synonym of 'poke fun at')
This is all the clue.
(Other definitions for ribs that I've seen before include "Chest bones, tasty when spare" , "Curved bones around the chest" , "Arched bones in the upper body" , "Is making fun of" , "Makes fun of - bones" .)