Cry of excitement (5)
I believe the answer is:
whoop
'cry of excitement' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for whoop that I've seen before include "Sound of war cry (or cough!)" , "Utter with excited cries" , "sound when transported" , "Hooting cry" , "Loud, enthusiastic cry" .)