Crossword Genius

In history, people having the right to be fishermen (7)

Ross

I believe the answer is:

anglers

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'be fishermen' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for anglers that I've seen before include "People fishing" , "Fishermen" .)

I've seen this clue in the Evening Standard.
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