Plant in factory fresh condition (4)
I believe the answer is:
mint
This clue is a quadruple definition!!
'plant' is the first definition.
(mint is a kind of plant)
'in' acts as a link.
'factory' is the second definition.
(thesaurus)
'fresh' is the third definition.
(thesaurus)
'condition' is the fourth definition.
(I have seen 'Perfect condition' mean 'mint' so perhaps 'condition' could also mean 'mint')
(Other definitions for mint that I've seen before include "Culinary herb" , "sweet to suck?" , "Place where a country's coins are made" , "fortune" , "Place where coin money is made" .)