Crossword Genius

Boat on a lake with a bird needing an injection of blood (8)

Ross

I believe the answer is:

mackinaw

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'boat' is the definition.
(mackinaw is a kind of boat)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for mackinaw that I've seen is " American Indian's blanket".)

I've seen this clue in The Hindu.
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