By the grace of God in court backing boundaries (5)

I believe the answer is:

edges

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

I can't explain the remainder of the clue.

(Other definitions for edges that I've seen before include "Des, e.g. (anag.)" , "Slowly moves" , "Sharpened sides of knives etc" , "They're used for cutting" , "Margins" .)

I've seen this clue in The Sunday Times and The Times.

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