Get wrong short cut following motorway (7)
I believe the answer is:
mishear
'get wrong' is the definition.
(hear something wrong)
'cut following motorway' is the wordplay.
'cut' becomes 'shear' (shearing is a kind of cutting).
'following' means one lot of letters go next to another.
'motorway' becomes 'MI' (resembles Ms, English motorway).
'shear' put after 'mi' is 'MISHEAR'.
'short' is the link.
(Other definitions for mishear that I've seen before include "Fail to pick up" , "Pick up wrong" , "Sense (words) wrongly" , "Wrongly catch" , "Incorrectly pick up" .)