It calls for patient driving (9)

I believe the answer is:

ambulance

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'it calls for patient driving' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for ambulance that I've seen before include "one seen by accident" , "Vehicle for transport to hospital" , "Vehicle for carrying the sick" , "It will bring you to hospital" , "Emergency vehicle" .)

I've seen this clue in The Globe and Mail.

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