Overseer very noisy when in an uncontrollable rage! (6)
I believe the answer is:
gaffer
'overseer' is the definition.
(thesaurus)
'very noisy when in an uncontrollable rage' is the wordplay.
'very noisy' becomes 'ff'.
'when in' indicates putting letters inside.
'an uncontrollable' is an anagram indicator (I've seen this in other clues).
'rage' with letters rearranged gives 'gaer'.
'ff' placed into 'gaer' is 'GAFFER'.
(Other definitions for gaffer that I've seen before include "one prone to blunder socially?" , "Old man" , "An old person" , "Informally, a boss or foreman" , "Chief electrician on a film set" .)