Crossword Genius

In uprising, plunder instrument (4)

Ross

I believe the answer is:

tool

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'instrument' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for tool that I've seen before include "Pawn" , "one of 12 [SPADES] , for example" , "Gun" , "Person exploited" , "Weapon" .)

I've seen this clue in The Irish Times.
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