This port is warm and dry, did you say? (3)

I believe the answer is:

ayr

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'this port' is the definition.
(I've seen this before)

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

(Other definitions for ayr that I've seen before include "Scottish salmon river" , "Scottish town sounds tuneful" , "Scots. town; sounds like song" , "Scottish resort" , "Town on Firth of Clyde" .)

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