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Legendary source of magic flier (6)

Ross

I believe the answer is:

merlin

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'flier' is the definition.
(merlin is a kind of birdanimal)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for merlin that I've seen before include "Legendary magician" , "Magician of the Round Table" , "BBC series" , "Hawk-like magician of Camelot" , "Bird of prey - magician" .)

I've seen this clue in The Telegraph.
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