Stick enthralling smart dog (6)
I believe the answer is:
canine
'dog' is the definition.
(thesaurus)
'stick enthralling smart' is the wordplay.
'stick' becomes 'cane' (cane is a kind of stick).
'enthralling' indicates putting letters inside.
'smart' becomes 'in' (as in fashionable).
'cane' placed around 'in' is 'CANINE'.
(Other definitions for canine that I've seen before include "like a setter" , "Maybe setter" , "A tooth; of our best friend" , "Fang" , "Tooth; dog" .)