Learner doctor does one's unfinished jobs (5,4)
I believe the answer is:
loose ends
'unfinished jobs' is the definition.
(loose ends are things still to be sorted)
'learner doctor does one's' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'doctor' is an anagram indicator.
'does'+'ones'='doesones'
'doesones' anagrammed gives 'ooseends'.
'l'+'ooseends'='LOOSE ENDS'
(Other definitions for loose ends that I've seen before include "items to be settled" , "details yet to be explained" , "Unfinished business" .)