Crossword Genius

A soldierly measure? (3)

Ross

I believe the answer is:

mil

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'measure?' is the definition.
(mil is a kind of measure)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mil that I've seen before include "One thousandth of an inch" , "One thousanth of an inch" , "One / one thousand inch" , "tiny distance" .)

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