Aaron in "Hamilton” (4)

I believe the answer is:

burr

(Other definitions for burr that I've seen before include "Prickly seed case - sound particular to certain dialects" , "Prickly seedcase of certain plants" , "trouble" , "Seed vessels with prickles" , "Whirring sound or small drill" .)

I've seen this clue in the King Feature Syndicate.

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