Crossword Genius

I'm into this, interrupting sadly prostrate conjuror (15)

Ross

I believe the answer is:

prestidigitator

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'conjuror' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for prestidigitator that I've seen before include "Tricky performer" , "Conjuror" , "Entertainer" , "Illusionist" .)

I've seen this clue in The Times.
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