Jungle sound (4)
I believe the answer is:
roar
'jungle sound' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for roar that I've seen before include "Jaguar, for example, emits this" , "The __ of the Greasepaint -- The Smell of the Crowd (1964 musical)" , "Deep loud sound as of lion or bull" , "Loud cry" , "Lion's sound" .)