Car style (8)
(Other definitions for roadster that I've seen before include "Open-topped car" , "Small open-top car" , "Old car" , "Open two-seater car" , "sporty vehicle" .)
(Other definitions for hardtop that I've seen before include "Car's rigid roof" , "Car with rigid roof" , "Rigid-roofed vehicle" , "Type of car with removable roof" , "Car with a rigid top" .)