False strokes producing boundaries (5)

I believe the answer is:

edges

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'boundaries' is the definition.
('edge' can be a synonym of 'boundary')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for edges that I've seen before include "Bounds" , "Sharpened sides of blades" , "Fringes" , "Des, e.g. (anag.)" , "Outside limits" .)

I've seen this clue in The Sun and The Independent.

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