Peter —, Best Actor in a Supporting Role Oscar winner for Topkapi (7)

I believe the answer is:

ustinov

(Other definitions for ustinov that I've seen before include "See 22" , "British actor and playwright" , "Sir Peter --, raconteur" , "Peter --, English actor and raconteur (d.2004)" , "Does it suit Nov to be an actor?" .)

I've seen this clue in The Mirror.

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