It doesn't really have a small driver's compartment (7)
I believe the answer is:
minicab
'it doesn't really' is the definition.
The definition suggests a singular noun which matches the answer.
'a small driver's compartment' is the wordplay.
'a small' becomes 'mini' (short for miniature).
'driver's compartment' becomes 'cab' (I've seen this in another clue).
'mini'+'cab'='MINICAB'
'have' is the link.
Can you help me to learn more?
(Other definitions for minicab that I've seen before include "Metered vehicle for hire" , "Car used as taxi" , "Type of car hire" , "Type of taxi" , "Hired vehicle" .)