Trainee losing pound is one waged (6)
I believe the answer is:
earner
'one waged' is the definition.
I can't judge whether this definition defines the answer.
'trainee losing pound' is the wordplay.
'trainee' becomes 'learner' (I've seen this before).
'losing' indicates named letters should be taken away.
'pound' becomes 'L' (the pound sign is based on an L).
'learner' with 'l' removed is 'EARNER'.
'is' is the link.
Can you help me to learn more?
(Other definitions for earner that I've seen before include "Worker with income" , "Means of acquiring money" , "The one who brings home the money" , "dubious money-making scheme" , "way to make money" .)