They're high up in the theatre (4)
I believe the answer is:
gods
'in the theatre' is the definition.
('the gods' are the highest seats in a theatre)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for gods that I've seen before include "Superhuman beings" , "Gallery of a theatre" , "high up in theatre" , "Deities" , "Idols" .)