Going off course like a confused stingray (8)
I believe the answer is:
straying
'going off course' is the definition.
(I've seen this in another clue)
'confused stingray' is the wordplay.
'confused' is an anagram indicator.
'stingray' with letters rearranged gives 'STRAYING'.
'like a' is the link.
(Other definitions for straying that I've seen before include "Being bad" , "aberration" , "Wandering from a direct course" , "Drifters may be" , "not on target" .)