Ship's officer the divorcee married? (6,4)

I believe the answer is:

second mate

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'ship's officer' is the definition.
(another term for the second officer of a ship)

I don't understand how the remainder of the clue works.

(Other definitions for second mate that I've seen before include "Craftsman, perhaps" , "Naval officer" , "one involved in bigamy?" .)

I've seen this clue in The Irish Independent.

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