It can be steered in an arc (3)
I believe the answer is:
'it can be steered' is the definition.
The definition suggests a singular noun which matches the answer.
'an arc' is the wordplay.
'arc' anagrams to 'CAR'.
However, I am not sure how this is indicated.
'in' is the link.
Can you help me to learn more?
(Other definitions for car that I've seen before include "Personal vehicle" , "Auto" , "Motor vehicle" , "Wheeled vehicle" , "saloon perhaps" .)