Screen actors gathering to perform again (7)
I believe the answer is:
reenact
'perform again' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for reenact that I've seen before include "Reproduce" , "Reconstruct in action" , "Re-ordain" , "Perform again" , "Represent what has happened earlier" .)