Move on tide at sea in Atlantic port (10)

I believe the answer is:

montevideo

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

'atlantic port' is the definition.
'montevideo' can be an answer for 'port' (I've seen this before). I'm not sure about the 'atlantic' bit.

'move on tide at sea' is the wordplay.
'at sea' is an anagram indicator.
'move'+'on'+'tide'='moveontide'
'moveontide' anagrammed gives 'MONTEVIDEO'.

'in' is the link.

Can you help me to learn more?

(Other definitions for montevideo that I've seen before include "Port" , "Capital of Uruguay" , "Uruguayan capital" .)

I've seen this clue in The Telegraph.

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