Distracted stingray wandering off (8)
I believe the answer is:
straying
'wandering off' is the definition.
'distracted stingray' is the wordplay.
'distracted' is an anagram indicator.
'stingray' is an anagram of 'STRAYING'.
(Other definitions for straying that I've seen before include "aberration" , "not on target" , "Being bad" , "Drifters may be" , "Wandering from a direct course" .)