Crossword Genius

Ultra-conservative parties (4)

Ross

I believe the answer is:

dodo

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'ultra-conservative' is the definition.
(I've seen this before)

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

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(Other definitions for dodo that I've seen before include "E [EXTINCT] bird" , "one finished?" , "Mauritian bird no more" , "Idiot" , "bird long dead" .)

I've seen this clue in The Sun and The Times.
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