Simply a saint (5)

I believe the answer is:

simon

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'saint' is the definition.
(I know that Simon is a saint)

I can't explain the rest of the clue.

(Other definitions for simon that I've seen before include "disciple" , "A simple character in nursery rhyme" , "he says it's a game" , "Bolivar, de Montfort, Callow or Cowell?" , "- Templar, The Saint" .)

I've seen this clue in the Evening Standard.

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