Off the track
I believe the answer is:
astray
'off the track' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for astray that I've seen before include "Wandering off the path" , "Go . . . . . . - get lost" , "Wandering lost" , "A satyr (anag.)" , "Off course - wrong - misled" .)