Passageway between buildings (5)
I believe the answer is:
alley
'passageway between buildings' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for alley that I've seen before include "Passage between buildings" , "Narrow lane; type of cat" , "Marble" , "Narrow back street" , "space in US court" .)