Two parties - one of them dead to the world (4)

I believe the answer is:

dodo

I'm a little stuck... Click here to teach me more about this clue!

'one of them dead to the world' is the definition.
I can't judge whether this defines the answer.

'two parties' is the wordplay.
'two parties' can mean two replacements for 'party'.
'party' becomes 'do' (do is a kind of party).
'party' becomes 'do' (do is a kind of party**).
'do'+'do'='DODO'

Can you help me to learn more?

(Other definitions for dodo that I've seen before include "Old fogey" , "Ultra-conservative" , "Mauritian bird no more" , "Extinct bird of Mauritius, very dead" , "E [EXTINCT] bird" .)

I've seen this clue in the Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.