Coach on which actors are seen (5)
I believe the answer is:
stage
'coach' is the definition.
(stagecoach)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for stage that I've seen before include "Phase; mount" , "Leg, section" , "Produce" , "Support for acting" , "Gates (anag.)" .)