Crossword Genius

Stumble across very short leaving party (5)

Ross

I believe the answer is:

disco

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'party' is the definition.
(I've seen this in other clues)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for disco that I've seen before include "Club or party with dancing" , "Demonic spirit" , "Party with records" , "Musical party" , "party for dancers" .)

I've seen this clue in The Daily Mail.
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