Crossword Genius

Lead-in to Xer, Yer, and Zer (3)

Ross

I believe the answer is:

gen

(Other definitions for gen that I've seen before include "Info" , "Information (colloq.)" , "Information yielded" , "opening book, in short" , "'Information, colloquially (3)'" .)

I've seen this clue in the LA Times.
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