Small weight (5)
'small weight' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ounce that I've seen before include "Small quantity - snow leopard" , "Weight; big cat" , "Wildcat" , "Twelfth of a pound" , "Carnivore" .)
'small weight' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for milligram that I've seen before include "chemist's dispensing unit required?" , "small amount" , "Lightweight" , "Tiny weight" , "One thousandth of a gram" .)