Snow leopards (6)
I believe the answer is:
ounces
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">snow leopards</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ounce' can be a synonym of 'snow leopard')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ounces that I've seen before include "Sixteen to a pound" , "There are 12 in a pound" , "Animals" , "Light weights in UNESCO" , "Sixteen of these to a lb" .)