Second anniversary of a press union? (5,7)

I believe the answer is:

paper wedding

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'second anniversary' is the definition.
The definition suggests an adjective which matches the answer.

'a press union?' is the wordplay.
'a press' becomes 'paper' (paper is a kind of press).
'union?' becomes 'wedding' (I've seen this in another clue).
'paper'+'wedding'='PAPER WEDDING'

'of' acts as a link.

Can you help me to learn more?

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

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