Crossword Genius

Herb used to make pesto (5)

Ross

I believe the answer is:

basil

(Other definitions for basil that I've seen before include "Man" , "named Cardinal Hume" , "Aromatic herb with purplish-green leaves" , "serially chaotic character" , "Herb - Mr Fawlty" .)

I've seen this clue in The Independent and The Times.
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