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Last to shoot weapon: it's not important (6)

Ross

I believe the answer is:

trifle

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(Other definitions for trifle that I've seen before include "more than half of 13 [AFTERSHAVE], for example" , "A mere dessert?" , "Dessert - toy" , "Mess" , "that doesn't matter" .)

I've seen this clue in The Guardian.
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