Foreman, boss (6)
I believe the answer is:
gaffer
I believe this is a double definition.
'foreman' is the first definition.
(I know that foreman can be written as gaffer)
'boss' is the second definition.
(gaffer can informally mean a boss)
(Other definitions for gaffer that I've seen before include "man in charge" , "Informal boss or foreman" , "Foreperson of a work squad" , "Chief electrician on a film set" , "one prone to blunder socially?" .)