Actors opening in Hugo musical for keeps (7)
I believe the answer is:
castles
'keeps' is the definition.
(I've seen this before)
'actors opening in hugo musical' is the wordplay.
'actors' becomes 'cast' (group of actors).
'opening in hugo musical' becomes 'les' (I can't explain this - if you can you should give a lot more credence to this answer).
'cast'+'les'='CASTLES'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for castles that I've seen before include "English homes?" , "Don't build the chess pieces in the air" , "buildings" , "Large and stately mansions" , "Fortresses" .)