Scottish port's dry, Sassenachs might say? (3)
I believe the answer is:
ayr
'scottish port's' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for ayr that I've seen before include "Scottish seaport" , "Scottish city" , "Town in Strathclyde" , "Scottish salmon river" , "Race course" .)