Mother of Caligula (9)

I believe the answer is:

agrippina

'mother of caligula' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for agrippina that I've seen before include "Emperor's sister" , "Roman emperor's wife" , "Greek murder victim" , "Mother of Caligula" , "Mother of Nero" .)

I've seen this clue in The Times.

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