Casters re-assigned performer (7)

I believe the answer is:

actress

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

'performer' is the definition.
(I know that actress is a type of actor)

'casters re-assigned' is the wordplay.
'casters' anagrams to 'ACTRESS'.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for actress that I've seen before include "Garland perhaps" , "Recasts (anag) - performer" , "Female stage-player" , "Female in plays/films" , "One playing" .)

I've seen this clue in The Independent.

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