Dash off genuine short (5)

I believe the answer is:

legit

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'dash off genuine short' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for legit that I've seen before include "Genuine" , "true, in a word?" , "In accordance with the law (abbr)" , "ok!" , "acceptable" .)

I've seen this clue in The Guardian.

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