Credit managed for headless boss (8)
I believe the answer is:
director
'boss' is the definition.
(I know that director is a type of leader of organization)
'credit managed for headless' is the wordplay.
'managed' is an anagram indicator.
'headless' means to remove the first letter.
'for' with its first letter removed is 'or'.
'credit' anagrammed gives 'direct'.
'direct'+'or'='DIRECTOR'
(Other definitions for director that I've seen before include "Manager, governor" , "Senior person in a firm, executive or non-executive" , "He makes films or runs companies" , "Big cheese" , "One on board" .)