At heart this Athenian is sanctimonious (5)

I believe the answer is:

timon

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'at heart this athenian' is the definition.
'timon' can be an answer for 'athenian' (as in Shakespeare's Timon of Athens). I'm not sure about the rest of the definition.

'sanctimonious' is the wordplay.
'TIMON' is hidden within the letters.
However, I am uncertain how this is indicated.

'is' is the link.

Can you help me to learn more?

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

I've seen this clue in The Globe and Mail.

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