Divert from byway (9)
I believe the answer is:
sidetrack
I believe this clue is a double definition.
'divert' is the first definition.
(sidetracking is a kind of diverting)
'byway' is the second definition.
(thesaurus)
'from' is the link.
(Other definitions for sidetrack that I've seen before include "Distract (from big issue)" , "Divert" , "lead away" , "small way" , "draw away" .)