The same Greek character estimated as the silliest (7)

I believe the answer is:

dopiest

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'the silliest' is the definition.
I can't tell whether this defines the answer.

'the same greek character estimated' is the wordplay.
'the same' becomes 'do' (abbreviation for ditto).
'greek character' becomes 'pi' (letter from the Greek alphabet).
'estimated' becomes 'est' (abbreviation).
'do'+'pi'+'est'='DOPIEST'

'as' acts as a link.

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I've seen this clue in the Sydney Morning Herald.

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