Crossword Genius

Fisher heads off homicidal Bostonian (6)

Ross

I believe the answer is:

angler

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'fisher' is the definition.
(angler is a kind of fisher)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for angler that I've seen before include "Fisher with hook and line." , "Sportsman" , "person hoping to catch fish" , "who looks for compliments" , "Strait; -- of Lochalsh" .)

I've seen this clue in the Sydney Morning Herald.
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