Fluid measure (5)
'fluid measure' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ounce that I've seen before include "Wildcat" , "Panther, perhaps" , "weight? Surely not" , "Big cat of Asia" , "Unit of weight - snow leopard" .)
'fluid measure' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for litre that I've seen before include "Unit of capacity in metric system" , "Nearly two pints" , "Mcc?" , "French volume" , "It's equal to about 1.75 pints" .)
(Other definitions for pint that I've seen before include "The working man's beer measure" , "Imperial measure of capacity" , "Quantity" , "Standard measure of Guinness" , "Glass of beer (colloq.)" .)