Eject all the people who've shown up? (4,3)
I believe the answer is:
turn out
'eject' is the definition.
(synonyms)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for turn out that I've seen before include "Eventually appear" , "switch off" , "All the voters" , "assembly" , "Prove" .)