Higher examiner? (4,5)
I believe the answer is:
test pilot
'higher examiner?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for test pilot that I've seen before include "Airman" , "Stop title (anag.)" , "one examining details of flight, spin, etc" , "Alan Shepard once?" , "highflying expert" .)