He may be in a car or under a coach (7)
I believe the answer is:
learner
'he may be in a car or under a coach' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he' is the wordplay.
I cannot really see how this works, but
'he' could be 'arne' and 'arne' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for learner that I've seen before include "Student (of driving?)" , "He displays the L-plate" , "Amateur" , "One under instruction" , "Disciple" .)