Gear Ono up for the herb (7)
I believe the answer is:
oregano
'gear ono up for the herb' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for oregano that I've seen before include "that's aromatic" , "Gear Ono up for the herb" , "aromatic plant" , "Mediterranean herb" , "Marjoram-like herb" .)