Crossword Genius

Weight of a cart? (5)

Ross

I believe the answer is:

carat

'weight' is the definition.
(I've seen this in another clue)

'of a cart?' is the wordplay.
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'a'+'cart'='acart'
'acart' is an anagram of 'CARAT'.

(Other definitions for carat that I've seen before include "Unit of weight used for gems" , "Gem weight unit" , "small weight" , "Unit of gem measurement" , "Unit of measurement for the proportion of gold in an alloy" .)

I've seen this clue in the Evening Standard.
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