The edge of the footpath provides some restriction, we hear (4)

I believe the answer is:

kerb

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'the edge' is the definition.
(kerb is a kind of edge)

I cannot understand how the remainder of the clue works.

(Other definitions for kerb that I've seen before include "Pancakes" , "Side of road" , "Pavement edging" , "stone by the way" , "Pavement edge" .)

I've seen this clue in The Irish News.

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