Measure - cat (5)
I believe the answer is:
ounce
This clue is a double definition.
'measure' is the first definition.
(ounce is a kind of measure)
'cat' is the second definition.
(ounce can mean a snow leopard)
(Other definitions for ounce that I've seen before include "Wildcat" , "Unit equal to about 28 grams" , "Small imperial weight" , "scrap" , "Wild cat or light weight" .)