Canter about in the end, delighted (9)
I believe the answer is:
entranced
'delighted' is the definition.
(I know that delighted can be written as entranced)
'canter about in the end' is the wordplay.
'about' is an anagram indicator.
'in' indicates putting letters inside.
'canter' anagrammed gives 'trance'.
'trance' going within 'end' is 'ENTRANCED'.
(Other definitions for entranced that I've seen before include "Cast a spell" , "Delighted" , "Filled with wonder" , "Captivated" , "hypnotised" .)