Motorist’s software (6)
I believe the answer is:
driver
This clue might be a double definition.
'motorist's' is the first definition.
(thesaurus)
'software' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
Can you help me to learn more?
(Other definitions for driver that I've seen before include "Operator of a motor vehicle" , "chauffeuse" , "See 1 down" , "Golf club for long shots" , "Flat-faced golf club" .)