Sound made by animal, male, beginning to eat fruit (6)
I believe the answer is:
heehaw
'sound made by animal' is the definition.
(cry of a donkey)
'male beginning to eat fruit' is the wordplay.
'male' becomes 'he'.
'beginning to' says to take the initial letters.
'fruit' becomes 'haw' (I've seen this before).
The initial letter of 'eat' is 'e'.
'he'+'e'+'haw'='HEEHAW'
(Other definitions for heehaw that I've seen before include "Sound from the stable?" , "Cry of donkey" , "Horse-laugh" , "Laugh of a donkey" , "Written bray of a donkey" .)