Weight of a snow leopard? (5)
I believe the answer is:
ounce
I believe this clue is a double definition.
'weight' is the first definition.
(ounce is a kind of weight)
'a snow leopard?' is the second definition.
(ounce is an alternative name for the snow leopard)
'of' is the link.
(Other definitions for ounce that I've seen before include "Small quantity - weight" , "not weighing very much" , "28.3495 grammes" , "Lightweight" , "Fraction of a pound" .)