It's magic! (3,6)

I believe the answer is:

hey presto

(Other definitions for hey presto that I've seen before include "Conjuror's exclamation at the climax of a trick" , "Spell words" , "Conjurer's exclamation" , "Conjuror's command or exclamation" , "Abracadabra" .)

I've seen this clue in The Guardian.

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