Crossword Genius

Extra number gathering for social dancing (2-4)

Ross

I believe the answer is:

no-ball

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'extra' is the definition.
(cricket)

I don't understand how the rest of the clue works.

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(Other definitions for no-ball that I've seen before include "Extra, in cricket" , "Illegal delivery by bowler in cricket" .)

I've seen this clue in The Telegraph.
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