All those on stage thrown off (4)

I believe the answer is:

cast

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'thrown off' is the definition.
'cast' can be an answer for 'thrown' (I've seen this before). I'm not certain of the 'off' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for cast that I've seen before include "Get rid of" , "Select actors for play or film" , "Team of actors in a play" , "Shed - actors" , "Complement of actors in a play" .)

I've seen this clue in The Times.

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