A hired vehicle or two (7)
I believe the answer is:
taxicab
'two' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'a hired vehicle' is the wordplay.
'a hired' becomes 'taxi' (I am not sure about this - if you are sure you should believe this answer much more).
'vehicle' becomes 'cab' (cab is a kind of vehicle).
'taxi'+'cab'='TAXICAB'
'or' is the link.
Can you help me to learn more?
(Other definitions for taxicab that I've seen before include "transport" , "Hire car" , "Licensed passenger vehicle" , "Vehicle for hire" .)