Animal giving a growl during certain measures (6)
I believe the answer is:
ferret
'animal' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(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" .)