Aaron who dueled Alexander Hamilton (4)

I believe the answer is:

burr

(Other definitions for burr that I've seen before include "Whirring sound or small drill" , "Prickly seed case that clings to clothing" , "Seeds with prickles" , "Rough projection left after cutting" , "The strong pronunciation of ''r''" .)

I've seen this clue in The Washington Post.

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