Yapped (6)
I believe the answer is:
yelped
'yapped' is the definition.
('yelp' can be a synonym of 'yap')
This is the entire clue.
(Other definitions for yelped that I've seen before include "Made shrill sound as of dog" , "Uttered sharp barks" , "Cried out sharply" , "(Dog) cried in pain" , "Uttered short cry like a dog" .)