Sonnet about units of measurement (6)

I believe the answer is:

tonnes

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'units of measurement' is the definition.
'tonnes' can be an answer for 'units' (tonne is a kind of unit). I am not certain of the 'of measurement' bit.

'sonnet about' is the wordplay.
'about' indicates anagramming the letters.
'sonnet' is an anagram of 'TONNES'.

Can you help me to learn more?

(Other definitions for tonnes that I've seen before include "Sonnet about metric weights" , "Metric tons" , "Weights of 1,000 kilograms" , "Sent on (anag.)" , "1000 kilogram weights" .)

I've seen this clue in The Mirror.

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