Ask for a dog treat (3)
I believe the answer is:
beg
'ask for a dog treat' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for beg that I've seen before include "Implore or cadge" , "Plead or importune" , "Ask for money, scrounge" , "Plead or ask for alms" , "Implore, solicit" .)