Crossword Genius

The beast gives a growl when measures are interrupted (6)

Ross

I believe the answer is:

ferret

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(Other definitions for ferret that I've seen before include "Small member of weasel family, good for catching rabbits" , "Search about persistently" , "Root around" , "Type of polecat -- or silk binding tape" , "Small weasel good at hunting rabbits" .)

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