Name just one heavyweight (5)

I believe the answer is:

anton

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'name just' is the definition.
The definition suggests a singular noun which matches the answer.

'one heavyweight' is the wordplay.
'one' becomes 'an' (an apple is one apple).
'heavyweight' becomes 'ton' (a ton weighs a lot).
'an'+'ton'='ANTON'

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(Other definitions for anton that I've seen before include "..... Chekov" , "man" , "Boy" , "- Chekhov, playwright" , "Chekhov maybe" .)

I've seen this clue in the Evening Standard.

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