Is Putin "blue"? (7)

I believe the answer is:

redhead

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'blue?' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for redhead that I've seen before include "One with distinctive hair" , "One with rufous hair" , "diving duck?" , "Ginger-haired person" , "member of ginger group?" .)

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

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