Here to spy producing tricky words? (3,6)
I believe the answer is:
hey presto
'tricky words?' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hey presto that I've seen before include "before your very eyes" , "Conjuror's exclamation at the climax of a trick" , "Magic words" , "tricky words?" , "suddenly, as if by magic" .)