Bard's duke's orison needs translating (6)

I believe the answer is:

orsino

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'bard's duke's' is the definition.
'orsino' can be an answer for 'duke's' (I've seen this before). I am unsure of the 'bard's' bit.

'orison needs translating' is the wordplay.
'orison' anagrams to 'ORSINO'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for orsino that I've seen before include "Shakespearean duke" , "one in Twelfth Night" , "Duke of Illyria" , "Twelfth Night duke" , "A Shakespearean role" .)

I've seen this clue in The Independent.

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