Strong-willed daughter on "Downton Abbey" (5)

I believe the answer is:

sybil

(Other definitions for sybil that I've seen before include "Dame - Thorndike, English actress" , "Female oracle; Mrs Fawlty" , "Basil Fawlty's wife" , "--- Thorndike, Fawlty" .)

I've seen this clue in The New York Times.

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