Aromatic plant in perfect condition (4)
I believe the answer is:
mint
I believe this is a double definition.
'aromatic plant' is the first definition.
(I've seen this before)
'perfect condition' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for mint that I've seen before include "sweet to suck?" , "A tangy sweet or coin-making place" , "Flavour of the money-maker?" , "packet" , "and 18 Down: Southern US cocktail" .)