Queen of Castile made her name as a libel negotiator (8)

I believe the answer is:

isabella

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'queen' is the definition.
(I have seen 'Spanish Queen ' mean 'isabella' so perhaps 'queen' could also mean 'isabella')

'castile made her name as a libel negotiator' is the wordplay.
'as a libel' can be anagrammed to 'ISABELLA'.
Though, I'm not clear how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for isabella that I've seen before include "Woman" , "drab colour" , "Wife of Edward II" , "Ferdinand V's queen" , "Wife of Ferdinand II of Aragon" .)

I've seen this clue in The Globe and Mail.

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