Canter around in hypnotic state (6)
I believe the answer is:
trance
'hypnotic state' is the definition.
(I've seen this in another clue)
'canter around' is the wordplay.
'around' is an anagram indicator.
'canter' with letters rearranged gives 'TRANCE'.
'in' is the link.
(Other definitions for trance that I've seen before include "Semi-conscious state" , "Canter in dream-state" , "Sleep-like, half-conscious state" , "State of abstraction" , "Canter into state of hypnosis" .)