Players cause titter in class (13)
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 Globe and Mail and The Irish News.
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