Blushing

I think it could be either:

Which length description are you looking for?:

red

'blushing' is the definition.
(blushing makes someone's face go red)

This is all the clue.

(Other definitions for red that I've seen before include "Crimson" , "Looking embarrassed" , "Flushed" , "- - poker: Kniphofia" , "could be a Marxist" .)

I've seen this clue in The Mirror.

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