Crossword Genius

Make fun of progressive characters in right-on liberal bubble (3)

Ross

I believe the answer is:

rib

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'make fun of' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

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(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" .)

I've seen this clue in The Independent.
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