Crossword Genius

Party subordinate in Canada once (8)

Ross

I believe the answer is:

dominion

'canada once' is the definition.
(I've seen this in another clue)

'party subordinate' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'subordinate' becomes 'minion' (I've seen this before).
'do'+'minion'='DOMINION'

'in' is the link.

(Other definitions for dominion that I've seen before include "Area of control" , "Authority to rule over and control people" , "Supremacy" , "power" , "Realm" .)

I've seen this clue in The Times.
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