Crossword Genius

Party at chief's estates (7)

Ross

I believe the answer is:

domains

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

'estates' is the definition.
The definition and answer can be both groups as well as being plural nouns.
Perhaps there's an association between them I don't understand?

'party at chief's' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'at' is a charade indicator (letters next to each other).
'chief's' becomes 'main's'.
'do'+'mains'='DOMAINS'

Can you help me to learn more?

(Other definitions for domains that I've seen before include "Areas" , "Realms" .)

I've seen this clue in the Sydney Morning Herald.
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