Complying with commands (8)
I believe the answer is:
obedient
'complying with commands' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for obedient that I've seen before include "Complying with commands" , "Ready to agree" , "Docile" , "A good dog should be" , "Submissive, compliant" .)