Marine creature turned up alone, shivering in Spanish port (9)
I believe the answer is:
barcelona
'spanish port' is the definition.
'marine creature turned up alone shivering' is the wordplay.
'marine creature' becomes 'crab'.
'turned up' shows that the letters should be reversed in order.
'shivering' indicates anagramming the letters.
'crab' written backwards gives 'barc'.
'alone' with letters rearranged gives 'elona'.
'barc'+'elona'='BARCELONA'
'in' acts as a link.
(Other definitions for barcelona that I've seen before include "Spain's second largest city" , "Big city" , "Largest Spanish port" , "City and province of Catalonia in NE Spain" , "coastal city" .)