Lion's greeting (4)
I believe the answer is:
roar
'lion's greeting' 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 "Yell" , "Make a loud noise" , "Lion's noise" , "The __ of the Greasepaint -- The Smell of the Crowd (1964 musical)" , "Lion's cry" .)