Crossword Genius

Security required around Saint, Russian Saint (5)

Ross

I believe the answer is:

basil

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'saint' is the definition.
(thesaurus)

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(Other definitions for basil that I've seen before include "Herb - Mr Fawlty" , "Herb of mint family" , "Doctor of the fourth century" , "Mediterranean herb" , "Fellow" .)

I've seen this clue in The Independent.
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