Mark, no ordinary saint (5)

I believe the answer is:

stain

I'm a little stuck... Click here to teach me more about this clue!

'mark' is the definition.
(I know that mark can be written as stain)

'no ordinary saint' is the wordplay.
'saint' can be anagrammed to 'STAIN'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for stain that I've seen before include "Penetrative dye; mark" , "Discolouration" , "Stigma" , "Unsightly mark" , "Colour, dye" .)

I've seen this clue in the Evening Standard.

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