Shelf with an angled margin (5)

I believe the answer is:

ledge

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This clue might be a double definition.

'shelf' is the first definition.
(synonyms)

'an angled margin' is the second definition.
'ledge' can be an answer for 'margin' (thesaurus). I am unsure of the 'an angled' bit.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for ledge that I've seen before include "Projecting shelf, horizontal projection" , "Projecting ridge on a mountain" , "Surface under e.g. window" , "Ridge or shelf" , "Narrow projecting shelf, on cliff or building" .)

I've seen this clue in the Evening Standard.

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