Manage company with power and energy (4)
I believe the answer is:
cope
'manage' is the definition.
(manage can mean to cope or do well)
'company with power and energy' is the wordplay.
'company' becomes 'co' (abbreviation).
'with' means one lot of letters go next to another.
'power' becomes 'p' (symbol in physics).
'and' says to put letters next to each other.
'energy' becomes 'e' (physics symbol as in E=mc2).
'co'+'p'+'e'='COPE'
(Other definitions for cope that I've seen before include "Join" , "Clerical vestment; to deal (with)" , "Manage, come to terms with" , "Manage to deal with the vestment" , "Handle a situation" .)