Sound like a lion (4)
I believe the answer is:
roar
'sound like a lion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for roar that I've seen before include "Bawl, bellow" , "Loud growl" , "Deep-throated cry" , "Loud noise of angry bull" , "engine noise" .)