Destroyed barnacle around second of month in Spanish port city (9)
I believe the answer is:
barcelona
'spanish port city' is the definition.
'barcelona' can be an answer for 'city' (Barcelona is an example). I am unsure of the 'spanish port' bit.
'destroyed barnacle around second of month' is the wordplay.
'destroyed' indicates anagramming the letters.
'around' means one lot of letters goes inside another.
'second of month' becomes 'o' (2nd letter of 'month').
'barnacle' is an anagram of 'barcelna'.
'barcelna' placed around 'o' is 'BARCELONA'.
'in' is the link.
Can you help me to learn more?
(Other definitions for barcelona that I've seen before include "coastal city" , "Major city in NE Spain" , "9/11 [OLYMPIC VENUE]" , "Spain's second largest city" , "Big city" .)