I count Simon as dreadfully smug! (13)

I believe the answer is:

sanctimonious

'smug' is the definition.
(thesaurus)

'i count simon as dreadfully' is the wordplay.
'dreadfully' indicates an anagram.
'i'+'count'+'simon'+'as'='icountsimonas'
'icountsimonas' with letters rearranged gives 'SANCTIMONIOUS'.

(Other definitions for sanctimonious that I've seen before include "Hypocritically moral" , "Ostentatiously pious" , "Canting" , "Self-righteous" , "Affecting piety" .)

I've seen this clue in The Times.

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