Make fun of progressive characters in right-on liberal bubble (3)
I believe the answer is:
rib
'make fun of' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rib that I've seen before include "that was sacrificed for wife originally" , "Eve was known as Adam's ..." , "spare one?" , "joke" , "Hinged rod in umbrella" .)