Crossword Genius

Animal giving a growl during certain measures (6)

Ross

I believe the answer is:

ferret

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'animal' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for ferret that I've seen before include "It's used to drive rabbits from their holes" , "Semi-domesticated polecat" , "Small fierce animal - good hunting rabbits" , "Animal trained to catch rabbits" , "Small carnivore" .)

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