Canter off in a daze (6)
I believe the answer is:
trance
'daze' is the definition.
(I've seen this before)
'canter off' is the wordplay.
'off' indicates an anagram.
'canter' anagrammed gives 'TRANCE'.
'in a' is the link.
(Other definitions for trance that I've seen before include "Catalepsy" , "Sleep-like state experienced in canter" , "Ecstasy" , "State of a medium in a seance" , "Canter into suspended animation" .)