Crossword Genius

Antonio's heavy heart (3)

Ross

I believe the answer is:

ton

I'm a little stuck... Click here to teach me more about this clue!

'heavy heart' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'antonio's' is the wordplay.
'TON' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ton that I've seen before include "1000 kilos" , "Two thousand - two hundred and forty pounds" , "Twenty cwt" , "Fashionable" , "People of fashion" .)

I've seen this clue in the Evening Standard.
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