Sides and top cut off hedges (5)

I believe the answer is:

edges

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'sides' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

(Other definitions for edges that I've seen before include "Sharpened sides of blades" , "Outside limits" , "They're farthest from the middle" , "Des, e.g. (anag.)" , "Slowly moves" .)

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

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