Student perhaps left job? (7)
I believe the answer is:
learner
'student perhaps' is the definition.
(student is a kind of learner)
'left job?' is the wordplay.
'left' becomes 'l' (common abbreviation).
'job?' becomes 'earner' (I have seen 'Good job' mean 'earner' so perhaps 'job' could also mean 'earner').
'l'+'earner'='LEARNER'
(Other definitions for learner that I've seen before include "Pupil or apprentice" , "One who studies" , "One under instruction" , "One under tuition" , "Amateur" .)