Cheers actress in backstreet (5)
I believe the answer is:
alley
I believe this clue is a double definition.
'cheers actress' is the first definition.
(I've seen this in another clue)
'backstreet' is the second definition.
(I've seen this in another clue)
'in' acts as a link.
(Other definitions for alley that I've seen before include "Walk" , "space in US court" , "garden path" , "Narrow passageway" , "Bowling lane" .)