Crossword Genius

It's not good for a legendary hero to be faultless! (3)

Ross

I believe the answer is:

bad

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'it's not good' is the definition.
(bad is the opposite of good)

I can't explain the rest of the clue.

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(Other definitions for bad that I've seen before include "SECOND HALF OF 16" , "Ill" , "Rotten, evil" , "Severe; of low standard" , "Substandard" .)

I've seen this clue in the Evening Standard.
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