Creditors upset the board (9)
I believe the answer is:
directors
'board' is the definition.
(thesaurus)
'creditors upset' is the wordplay.
'upset' indicates anagramming the letters.
'creditors' anagrammed gives 'DIRECTORS'.
'the' acts as a link.
(Other definitions for directors that I've seen before include "Those managing" , "who make cuts" , "Board members" , "they lead the way" , "Businessmen" .)