Crossword Genius

Players cause titter in class (13)

Ross

I believe the answer is:

clarinettists

'players' is the definition.
(clarinettist is a kind of player)

'cause titter in class' is the wordplay.
'cause' indicates anagramming the letters.
'titter'+'in'+'class'='titterinclass'
'titterinclass' with letters rearranged gives 'CLARINETTISTS'.

I've seen this clue in The Irish News and The Globe and Mail.
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