Stagehands and cast learned to accommodate this ephemeral structure (10)
I believe the answer is:
sandcastle
'ephemeral structure' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'stagehands and cast learned to accommodate' is the wordplay.
'to accommodate' says the answer is hidden in the clue (I've seen 'accommodates' mean this).
'SANDCASTLE' is hidden within 'stagehands and cast learned'.
'this' acts as a link.
Can you help me to learn more?
(Other definitions for sandcastle that I've seen before include "Model on a beach" , "one that goes with the flow?" , "Fortress constructed on the beach" .)