Port on the Clyde
I believe the answer is:
glasgow
'port on the clyde' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for glasgow that I've seen before include "Where to find Sauchiehall Street" , "Scottish city on the Clyde" , "Sauchiehall St. city" , "Scotland's largest city" , "City of strangely low gags" .)