Aristotle —, Turkey-born shipowner who married Jackie Kennedy in 1968 (7)

I believe the answer is:

onassis

(Other definitions for onassis that I've seen before include "Aristotle -, married Jackie Kennedy" , "He married J. Kennedy" , "big name in shipping" , "Shipowner called Aristotle" , "First lady once" .)

I've seen this clue in The Mirror.

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