Dispense with part of the play - theatre curtain required (4,5)

I believe the answer is:

drop scene

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'dispense with part of the play theatre' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'curtain required' is the wordplay.
'curtain' becomes 'drop' (drop is a kind of curtain).
'required' becomes 'scene' (I can't explain this - if you can you should give a lot more credence to this answer).
'drop'+'scene'='DROP-SCENE'

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I've seen this clue in The Irish News.

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