Crossword Genius

Cube's dozen (5)

Ross

I believe the answer is:

edges

'cube's dozen' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for edges that I've seen before include "Boundaries of a surface" , "Outer limits" , "Sharpened sides of knives etc" , "Bounds" , "Sharpened sides of blades" .)

I've seen this clue in the Universal, The Washington Post, The Wall Street Journal, the L.A. Times Daily, the USA Today and The Washington Post Sunday.
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