Taxi (3)
'taxi' is the definition.
(synonyms)
This is all the clue.
(Other definitions for cab that I've seen before include "Transport" , "A taxi in New York" , "Driver's compartment, in lorry say" , "Organisation to collect money made from crime" , "It has the authority to confiscate the proceeds of crime, in short" .)
'taxi' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for minicab that I've seen before include "Type of taxi" , "Metered vehicle for hire" , "It can't be hailed in the street" , "Car used as taxi" , "Type of car hire" .)