Joint of meat that's found by side of road (8)
I believe the answer is:
shoulder
This clue is a double definition.
'joint of meat' is the first definition.
'that's found by side of road' is the second definition.
(Other definitions for shoulder that I've seen before include "take responsibility?" , "Old usher, oddly, is part of the body" , "Edible part of lamb" , "Undertake (burden)" , "Body part of a strange old usher" .)