One nicknamed "Blue"! (7)

I think it could be either:

Which length description are you looking for?:

3-4

redhead

(Other definitions for redhead that I've seen before include "Auburn type" , "Bluey" , "One with rufous hair" , "Ginger-haired person" , "One with distinctive hair" .)

I've seen this clue in the Sydney Morning Herald.

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