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My bad theatre job, enormous curtains (4)

Ross

I believe the answer is:

oops

I'm a little stuck... Click here to teach me more about this clue!

'my bad' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for oops that I've seen before include "Exclamation of making a blunder" , "Exclamation on making minor error" , "I'm sorry" , "Exclamation recognising a mistake has been made" , "My bad" .)

I've seen this clue in The Times.
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