Learner in depression over Master's degree (7)
I believe the answer is:
diploma
'degree' is the definition.
(I know that Diploma is a type of degree)
'learner in depression over master's' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'in' is an insertion indicator.
'depression' becomes 'dip' (dip is a kind of depression).
'over' becomes 'o' (cricket abbreviation).
'master' becomes 'ma' (Master of Arts).
'dip'+'o'='dipo'
'l' put into 'dipo' is 'diplo'.
'diplo'+'ma'='DIPLOMA'
(Other definitions for diploma that I've seen before include "Certificate of achievement" , "Certificate of proficiency" , "Academic award" , "degree certificate" , "Document conferring honour" .)