Actors leaving to do some knitting (7)

I believe the answer is:

castoff

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'do some knitting' is the definition.
The definition suggests a singular noun which matches the answer.

'actors leaving' is the wordplay.
'actors' becomes 'cast' (group of actors).
'leaving' becomes 'off' (as in 'I'm off').
'cast'+'off'='CASTOFF'

'to' is the link.

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(Another definition for castoff that I've seen is " rejected?".)

I've seen this clue in The Mirror.

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