Glen lost head in the backstreet (5)
I believe the answer is:
alley
'backstreet' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for alley that I've seen before include "Walk" , "Marble" , "Narrow passageway" , "Bowling lane" , "Passage between buildings" .)