Crossword Genius

An arresting shade? (3)

Ross

I believe the answer is:

red

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'shade?' is the definition.
(red is a colour or shade)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for red that I've seen before include "Colour of communism" , "Colour for danger" , "- - poker: Kniphofia" , "Colour of blood" , "Flushed" .)

I've seen this clue in the Evening Standard.
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