Shakespearean heroine: Viola, I fancy (6)

I believe the answer is:

olivia

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'shakespearean heroine' is the definition.
The definition suggests a singular noun which matches the answer.

'viola i fancy' is the wordplay.
'fancy' indicates anagramming the letters.
'viola'+'i'='violai'
'violai' with letters rearranged gives 'OLIVIA'.

Can you help me to learn more?

(Other definitions for olivia that I've seen before include "Countess in Twelfth Night" , "- de Havilland, US film actress" , "Woman" , "-- Newton-John, singer" , "Female character in Twelfth Night" .)

I've seen this clue in The Independent.

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