Her actors retrained as musicians (9)

I believe the answer is:

orchestra

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

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

'her actors retrained' is the wordplay.
'her actors' anagrams to 'ORCHESTRA'.
But, I'm not clear how the anagram is indicated.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for orchestra that I've seen before include "Large music group" , "Big group of musicians playing various instruments" , "Large musical group" , "Musicians, maybe in theatre" , "alternative to the organ" .)

I've seen this clue in The Independent.

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