Firth of Tay port (6)
I believe the answer is:
dundee
'firth of tay port' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dundee that I've seen before include "City in Scotland and a cake" , "Scots city of cake fame" , "Scottish city with cakes" , "Tayside city, Dens Park team" , "Crocodile -; - cake" .)