A way through on foot (4)

I believe the answer is:

arch

This clue is a double definition.

'a way through' is the first definition.
(I've seen this before)

'on foot' is the second definition.
(I've seen this before)

(Other definitions for arch that I've seen before include "Knowing, coy" , "Masonry construction for spanning an opening" , "Curved vault" , "spanner" , "Curve spanning an opening" .)

I've seen this clue in The Guardian and The Globe and Mail.

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