The falcon Arthur did wonders with (6)

I believe the answer is:

merlin

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'the falcon' is the definition.
(merlin is a kind of falcon)

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

(Other definitions for merlin that I've seen before include "Arthur's adviser" , "Kind of hawk or Camelot's magician" , "one that cast a spell in Arthur's court" , "could be relied on for a spell?" , "Small falcon; Arthur's friend" .)

I've seen this clue in The Globe and Mail.

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