Full of energy, social worker makes progress at work (6)
I believe the answer is:
career
'progress at work' is the definition.
'full of energy social worker' is the wordplay.
'full of' is an insertion indicator.
'energy' becomes 'e' (physics symbol as in E=mc2).
'social worker' becomes 'carer'.
'e' put inside 'carer' is 'CAREER'.
'makes' is the link.
(Other definitions for career that I've seen before include "Go at top speed through a working life?" , "Job (supposedly for life?)" , "making progress" , "'Occupation, profession (6)'" , "Move headlong at high speed" .)