Crossword Genius

As anti-mosquito treatment, play it again Sam? (12)

Ross

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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