Crossword Genius

Correspondence from overseas resort captures Tropics (7,8)

Ross

I believe the answer is:

picture postcard

I'm a little stuck... Click here to teach me more about this clue!

'correspondence' is the definition.
(I know that picture postcard is a type of mailing-card)

'from overseas resort captures tropics' is the wordplay.
I cannot quite see how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
an anagram of 'captures' is 'urepstca' which is present in the remaining letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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