__ Oliver, friend of Hercule Poirot? (7)

I believe the answer is:

ariadne

(Other definitions for ariadne that I've seen before include "She helped Theseus escape from the Minotaur's labyrinth" , "Daughter of Minos who eloped with Theseus" , "In title role" , "daughter of Cretan king?" , "Aid near (anag) - Theseus's girl" .)

I've seen this clue in The Guardian.

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