Petrolhead short of fuel drove one finally for a spin (7)
I believe the answer is:
hardtop
'petrolhead short' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'fuel drove one finally for a spin' is the wordplay.
I cannot quite see how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is found in the answer.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for hardtop that I've seen before include "Rigid-roofed vehicle" , "Sort of car" , "Car's rigid roof" , "Car with a rigid top" , "Non-convertible car" .)