Crossword Genius

American predator beginning to disturb pirate (10)

Ross

I believe the answer is:

blackbeard

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'pirate' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for blackbeard that I've seen is " Pirate".)

I've seen this clue in The Times.
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