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Family document about good party with royal associations? (8)

Ross

I believe the answer is:

kingdoms

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

'royal associations?' is the definition.
The definition and answer can be both groups as well as being plural nouns.
Maybe there's a link between them I don't understand?

'family document about good party' is the wordplay.
'family' becomes 'kin' (synonyms).
'document' becomes 'ms'.
'about' means one lot of letters go next to another.
'good' becomes 'g' (abbreviation).
'party' becomes 'do' (do can informally mean a party).
'g'+'do'='gdo'
'ms' after 'gdo' is 'gdoms'.
'kin'+'gdoms'='KINGDOMS'

'with' is the link.

Can you help me to learn more?

(Other definitions for kingdoms that I've seen before include "Domains of royalty" , "Lands of monarchs" .)

I've seen this clue in The Independent.
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