Seeing no more stars upset them (11)
I believe the answer is:
directorate
'them' is the definition.
(thesaurus)
'seeing no more stars upset' is the wordplay.
'seeing no more stars' becomes 'director' (I can't justify this - if you can you should believe this answer much more).
'upset' becomes 'ate' (to eat up is worry or upset).
'director'+'ate'='DIRECTORATE'
Can you help me to learn more?
(Other definitions for directorate that I've seen before include "Those running company" , "Board members" , "Bosses" , "governors" , "Part of government department dealing with a particular activity" .)