Crossword Genius

Various papers distributed after union session (8)

Ross

I believe the answer is:

confetti

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This clue might be a double definition.

'various papers' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'distributed after union session' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

Can you help me to learn more?

(Other definitions for confetti that I've seen before include "Bits thrown at weddings" , "Coloured paper thrown at a wedding" , "Paper pieces festively thrown" , "Bits thrown over newly-weds" , "Scraps of coloured paper thrown in celebration" .)

I've seen this clue in The Times.
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