Crossword Genius

Lead-in to "X," "Y" or "Z" (3)

Ross

I believe the answer is:

gen

'lead-in to x y or z' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for gen that I've seen before include "'Information, colloquially (3)'" , "Information (colloq.)" , "Lowdown (sl.)" , "Information yielded" , "Knowledge" .)

I've seen this clue in the Universal.
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