Pupil is one who gets a pound in wages (7)
I believe the answer is:
learner
'pupil' is the definition.
(I know that learner is a type of pupil)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for learner that I've seen before include "Someone undergoing education" , "Unqualified driver" , "One under instruction" , "Pupil, novice" , "Trainee (driver)" .)