Crossword Genius

Shotgun caliber (5)

Ross

I believe the answer is:

'shotgun caliber' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for gauge that I've seen before include "Measure(r)" , "Measuring instrument" , "Measure against a standard" , "Measure - estimate" , "Rail track width" .)

I've seen this clue in The Mirror.
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