Crossword Genius

Rule material (5)

Ross

I believe the answer is:

steel

'rule material' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for steel that I've seen before include "Strength, determination" , "Structural metal alloy" , "Mixture of carbon and iron" , "Knife-sharpener" , "Iron/carbon alloy" .)

I've seen this clue in the Newsday and the Newsday.com.
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