Carriage used in taxi hire around port (9)
I believe the answer is:
cabriolet
'carriage' is the definition.
(cabriolet is a kind of carriage)
'taxi hire around port' is the wordplay.
'taxi' becomes 'cab' ('cab' can be a synonym of 'taxi').
'hire' becomes 'let' (I've seen this in other clues).
'around' means one lot of letters goes inside another.
'port' becomes 'rio' (I've seen this before).
'cab'+'let'='cablet'
'cablet' enclosing 'rio' is 'CABRIOLET'.
'used in' is the link.
(Other definitions for cabriolet that I've seen before include "Soft-top car" , "Car - old horse-drawn carriage with a folding hood" , "Light two-wheeled carriage" , "Horse-drawn carriage with two seats and a folding hood" , "Car with a folding top -- trace boil (anag)" .)