Athenian method of working in tin (5)

I believe the answer is:

timon

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'athenian' is the definition.
(I've seen this before)

'method of working in tin' is the wordplay.
'method of' becomes 'mo' (this might be a standard abbreviation which I don't know about).
'working in' is an insertion indicator.
'mo' inserted inside 'tin' is 'TIMON'.

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(Other definitions for timon that I've seen before include "Athenian in Shakespeare play" , "- - of Athens (Shakespeare)" , "part of Shakespeare" , "legendary misanthrope" , "The Bard's Athenian" .)

I've seen this clue in the Evening Standard.

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