Herb in perfect condition (4)
I believe the answer is:
mint
I believe this clue is a double definition.
'herb' is the first definition.
(mint is a kind of herb)
'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 "Huge sum of money" , "A tangy sweet or coin-making place" , "Culinary herb" , "Building where coin money is made (4)" , "A bomb" .)