Said to be an absolute boss in journalism (7)
I believe the answer is:
uttered
'said' is the definition.
(I've seen this in another clue)
'absolute boss in journalism' is the wordplay.
I cannot really see how this works, but
'absolute' could be 'utter' (synonyms) and 'utter' is located in the answer.
'boss' could be 'ed' (short for editor - newspaper boss) and 'ed' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'to be an' is the link.
Can you help me to learn more?
(Other definitions for uttered that I've seen before include "In law, put forged money into circulation" , "Said (something)" , "Spoke and put into circulation" , "Spoken" , "Pronounced" .)