Clio goes around in one (7,6)
I believe the answer is:
turning circle
'clio' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I can't see?
'goes around in one' is the wordplay.
I cannot quite see how this works, but
'around' could be 'c' (abbreviation for 'circa') and 'c' is found within the answer.
'in' is within the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for turning circle that I've seen before include "Smallest space to drive round in vehicle" , "revolutionary movement" , "Smallest space for vehicle to go about" , "Smallest possible arc for a vehicle" , "Smallest area in which a car can go round" .)