Crossword Genius

Improvised performance in WI event? (3,7)

Ross

I believe the answer is:

jam session

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'improvised performance' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for jam session that I've seen before include "time for a sarnie?" , "improvised performance" , "jazz performance" , "Gathering of jazz musicians" , "playing of improvised bebop?" .)

I've seen this clue in The Sunday Times.
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