King of ancient Rome (3)

I believe the answer is:

rex

'king of ancient rome' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for rex that I've seen before include "Part of official title of a king" , "One in the palace" , "King's title" , "Oedipus - -" , "King - Harrison?" .)

I've seen this clue in The Washington Post, The New York Times and the L.A. Times Daily.

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