Crossword Genius

He's warned when there's a fight starting! (3)

Ross

I believe the answer is:

ned

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'he's' is the definition.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for ned that I've seen before include "rough" , "A den for Edward" .)

I've seen this clue in the Evening Standard.
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