Ultra-conservative parties (4)
I believe the answer is:
dodo
'ultra-conservative' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for dodo that I've seen before include "E [EXTINCT] bird" , "one finished?" , "Mauritian bird no more" , "Idiot" , "bird long dead" .)