To go motoring with a beginner is simply not sensible (6)
I believe the answer is:
drivel
'simply not sensible' is the definition.
I can't judge whether this defines the answer.
'to go motoring with a beginner' is the wordplay.
I cannot really see how this works, but
'go' could be 'drive' (driving is a kind of going) and 'drive' is found within the answer.
'beginner' could be 'l' (as in a learner driver with L-plates on their car) and 'l' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
(Other definitions for drivel that I've seen before include "Foolishness" , "Gibberish" , "Silly talk, sheer nonsense" , "Nonsensical talk" , "Slaver" .)