Crossword Genius

Imperial weight (5)

Ross

I believe the answer is:

ounce

'imperial weight' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ounce that I've seen before include "16 for a pound" , "Light weight coming in on cue" , "Fraction of a pound" , "On cue (anag.)" , "Twelfth of a pound" .)

I've seen this clue in The Irish Times and The Mirror.
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