First wife, possibly not welcome when turning up, sold overseas (8)

I believe the answer is:

exported

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'not welcome when turning up sold overseas' is the definition.
I can't tell whether this defines the answer.

'first wife possibly' is the wordplay.
'first wife' becomes 'ex' (I've seen this in other clues).
'possibly' becomes 'ported' (I can't explain this - if you can you should believe this answer much more).
'ex'+'ported'='EXPORTED'

Can you help me to learn more?

I've seen this clue in The Telegraph.

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