Summoning energy with one's chosen job (9)
I believe the answer is:
evocation
'summoning' is the definition.
(synonyms)
'energy with one's chosen job' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'with' is a charade indicator (letters next to each other).
'one's chosen job' becomes 'vocation' (a vocation is a career).
'e'+'vocation'='EVOCATION'
(Other definitions for evocation that I've seen before include "A spell" , "A calling forth" .)