New palace overseas for Lothario (8)

I believe the answer is:

casanova

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'lothario' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for casanova that I've seen before include "18th century Italian lover" , "Notorious lover" , "Amorous Venetian" , "Giacomo" , "Famous Italian" .)

I've seen this clue in The Guardian.

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