Crossword Genius

Genetic information? (3)

Ross

I believe the answer is:

gen

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'information?' is the definition.
(gen can informally mean information)

I don't understand the rest of the clue.

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(Other definitions for gen that I've seen before include "opening book, in short" , "Lowdown (sl.)" , "Knowledge" , "Informal information" , "Information yielded" .)

I've seen this clue in the Evening Standard.
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