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Union notices (8,5)

Ross

I believe the answer is:

marriage banns

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'union notices' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'union notices' is the wordplay.
'union' becomes 'marriage' (synonyms).
'notices' becomes 'banns' (I have seen 'Notices of marriage ' mean 'banns' so perhaps 'notices' could also mean 'banns').
'marriage'+'banns'='MARRIAGE BANNS'

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I've seen this clue in The Globe and Mail.
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