Foreman’s error? Right! (6)
I believe the answer is:
gaffer
'foreman's' is the definition.
(synonyms)
'error? right' is the wordplay.
'error?' becomes 'gaffe' (gaffe is a kind of error).
'right' becomes 'r' (common abbreviation).
'gaffe'+'r'='GAFFER'
(Other definitions for gaffer that I've seen before include "Informally, a boss or foreman" , "Old man" , "An old person" , "Informal boss or foreman" , "Chief electrician on a film set" .)