Transport country flower (9)
I believe the answer is:
carnation
'flower' is the definition.
(carnation is a kind of flower)
'transport country' is the wordplay.
'transport' becomes 'car' (car is a kind of transport).
'country' becomes 'nation' (synonyms).
'car'+'nation'='CARNATION'
(Other definitions for carnation that I've seen before include "Feature of many a wedding" , "Pink/white/red flower" , "Anoint car with the strange flower" , "Oscar Wilde wore a green one" , "Not in a car (anag) - plant" .)