Glen removed initial passage (5)

I believe the answer is:

alley

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'passage' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for alley that I've seen before include "Passage between buildings" , "Bowling lane" , "garden path" , "Passage between houses, perhaps" , "space in US court" .)

I've seen this clue in The Daily Express.

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