Striking actors start to sabotage The Vanquished (8)

I believe the answer is:

outcasts

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

'the vanquished' is the definition.
I can't tell whether this defines the answer.

'striking actors start to sabotage' is the wordplay.
'striking' becomes 'out' (striking out is a common phrase).
'actors' becomes 'cast' (I've seen this before).
'start to' suggests taking the first letters.
The initial letter of 'sabotage' is 's'.
'out'+'cast'+'s'='OUTCASTS'

Can you help me to learn more?

(Other definitions for outcasts that I've seen before include "People rejected by society" , "Pariahs" .)

I've seen this clue in The Telegraph.

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