Imperial weight (5)
'imperial weight' is the definition.
(I've seen this before)
This is the entire 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" .)
'imperial weight' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ton that I've seen before include "See 25" , "1000 kilos" , "Two thousand, two hundred and forty lbs avoirdupois" , "Two thousand - two hundred and forty pounds" , "Unit of weight equivalent to 2240 pounds" .)