As anti-mosquito treatment, play it again Sam? (12)
I believe the answer is:
misquotation
'play it again sam?' is the definition.
(common misquotation from the film Casablanca)
'as anti-mosquito treatment' is the wordplay.
'anti-mosquito' can be anagrammed to 'MISQUOTATION'.
Though, I'm not clear how this is indicated.
I've seen this clue in The Guardian.
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