Lie adjacent to (4)
I believe the answer is:
abut
'lie adjacent to' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for abut that I've seen before include "End or lean against, say a building" , "Be next to -- share a boundary" , "Touch upon" , "Adjoin, border" , "Touch (side of next building)" .)