Leader of the Argonauts in search of the Golden Fleece (5)

I believe the answer is:

jason

(Other definitions for jason that I've seen before include "Greek hero who searched for the Golden Fleece" , "Boy" , "He sailed the Argo to find the Golden Fleece" , "He sailed in search of the Golden Fleece" , "Argonaut leader" .)

I've seen this clue in The Irish Times.

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