Antonia carries much weight (3)

I believe the answer is:

ton

'much weight' is the definition.
(unit of weight)

'antonia carries' is the wordplay.
'carries' indicates the answer is hidden within the clue.
'TON' is hidden within 'antonia'.

(Other definitions for ton that I've seen before include "2240 Ibs" , "Century" , "20cwt" , "2240lbs" , "See 25" .)

I've seen this clue in The Sun.

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