Crossword Genius

Being already bad, is unable to go off! (3)

Ross

I believe the answer is:

dud

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'being' is the definition.
(dud is a kind of being)

I can't explain the remainder of the clue.

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(Other definitions for dud that I've seen before include "Palindrome for a flop" , "Ineffectual thing/person" , "Explosive not detonating" , "Broken" , "Bullet that fails to fire" .)

I've seen this clue in the Evening Standard.
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