Crossword Genius

Join masses dancing for music performance (3,7)

Ross

I believe the answer is:

jam session

'music performance' is the definition.
(improvised musical performance)

'join masses dancing' is the wordplay.
'dancing' is an anagram indicator.
'join'+'masses'='joinmasses'
'joinmasses' is an anagram of 'JAM SESSION'.

'for' acts as a link.

(Other definitions for jam session that I've seen before include "improvised performance" , "jazz performance" , "time for a sarnie?" , "Impromptu 22 concert" , "Gathering of jazz musicians" .)

I've seen this clue in The Guardian.
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