Fellow needing time to run (6)
I believe the answer is:
manage
'to run' is the definition.
(run can mean to manage or be in charge of)
'fellow needing time' is the wordplay.
'fellow' becomes 'man' (fellow can mean a man).
'needing' means one lot of letters go next to another.
'time' becomes 'age' (an age is a period of time).
'man'+'age'='MANAGE'
(Other definitions for manage that I've seen before include "Exercise control - don't fail" , "Run (a football team)" , "Take control" , "Run, oversee" , "Supervise staff" .)