"Scarborough Fair" herb
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
sage
'scarborough fair herb' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sage that I've seen before include "___ and onion" , "Savant" , "Salvia" , "Herb for the wise one" , "Solon, for instance" .)