UNESCO changes amounts of weight (6)

I believe the answer is:

ounces

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'amounts of weight' is the definition.
'ounces' can be an answer for 'amounts' (ounce is a kind of amount). I am unsure of the 'of weight' bit.

'unesco changes' is the wordplay.
'changes' indicates an anagram.
'unesco' anagrammed gives 'OUNCES'.

Can you help me to learn more?

(Other definitions for ounces that I've seen before include "Small weights in UNESCO" , "Imperial measures of weight" , "less than a pound?" , "Small units of weight" , "Animals" .)

I've seen this clue in the Sydney Morning Herald.

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