Dismount and give order to excitable dog (3,4)
I believe the answer is:
get down
'dismount' is the definition.
(synonyms)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for get down that I've seen before include "Dismount, alight" , "you could - from duck" , "Swallow" , "See feathers, > alight" .)