Crossword Genius

Trap quickly springs up: end of mouse! (5)

Ross

I believe the answer is:

noose

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But I can't explain it at all! Could you help me understand?

(Other definitions for noose that I've seen before include "Hangman's equipment" , "Halter loop" , "form of punishment" , "head could go in it" , "Device for capital punishment" .)

I've seen this clue in The Sun and The Telegraph.
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