Ending in school, professional student (7)
I believe the answer is:
learner
'student' is the definition.
(someone who is learning)
'ending in school professional' is the wordplay.
I cannot really see how this works, but
'professional' could be 'rn' (RN is an example) and 'rn' is located 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 "Someone undergoing education" , "A student or beginner" , "Scholar - novice" , "One with an L-plate" , "Pupil or apprentice" .)