Vehicle's ability influencing friends (7,6)

I believe the answer is:

turning circle

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'vehicle's' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for turning circle that I've seen before include "Measure of vehicle's manoeuvrability" , "Smallest possible arc for a vehicle" , "Smallest space for vehicle to go about" , "Smallest area in which a car can go round" , "Smallest space to drive round in vehicle" .)

I've seen this clue in The Daily Express.

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