Run an establishment - look upset with those in attendance (4,5)
I believe the answer is:
keep house
'upset with those in attendance' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'run an establishment look' is the wordplay.
'run' becomes 'keep' (I've seen this before).
'an establishment look' becomes 'house' (I can't justify this - if you can you should believe this answer much more).
'keep'+'house'='KEEP HOUSE'
Can you help me to learn more?
(Another definition for keep house that I've seen is " Manage an establishment".)