Beatrix Potter's great character? (5)

I believe the answer is:

peter

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'beatrix' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I don't see?

'potter's great character?' is the wordplay.
'potter's great' becomes 'pete' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'character?' becomes 'r'.
'pete'+'r'='PETER'

Can you help me to learn more?

(Other definitions for peter that I've seen before include "Disciple" , "- Sellers, twentieth century English comedian" , "- Pan, eternal youth" , "In whist, play" , "prison cell" .)

I've seen this clue in the Evening Standard.

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