Crossword Genius

Glen lost head in the backstreet (5)

Ross

I believe the answer is:

alley

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'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" .)

I've seen this clue in The Daily Express.
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