Immediate boss making changes to anger menial (4,7)
I believe the answer is:
line manager
'immediate boss' is the definition.
(I've seen this before)
'changes to anger menial' is the wordplay.
'changes' indicates anagramming the letters.
'anger'+'menial'='angermenial'
'angermenial' anagrammed gives 'LINE MANAGER'.
'making' acts as a link.
(Other definitions for line manager that I've seen before include "Person directly responsible for an employee" , "fond of angling?" , "Immediate boss" .)