Responsible person conserves energy in race (6)
I believe the answer is:
career
'race' is the definition.
(career can mean to race or move out of control)
'responsible person conserves energy' is the wordplay.
I cannot really see how this works, but
'energy' could be 'e' (physics symbol as in E=mc2) and 'e' is located in the answer.
'responsible person' could be 'carer' (I've seen this before) and 'carer' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for career that I've seen before include "Working lifetime" , "Run - profession" , "Move rapidly in progress through life" , "Go at top speed through a working life?" , "Life (in terms of work etc)" .)