Revolutionary actors siding with revolutionary soldiers (6)

I believe the answer is:

castro

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

'revolutionary' is the definition.
(I know this)

'actors siding with revolutionary soldiers' is the wordplay.
'actors' anagrams to 'CASTRO'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for castro that I've seen before include "Old leader" , "Cuba's chief Fidel" , "Cuban dictator" , "Latin-American presidential co-star" , "Fidel or Raul" .)

I've seen this clue in The Times.

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