Poems about Sweden's capital, a port (6)
I believe the answer is:
odessa
'port' is the definition.
(I've seen this before)
'poems about sweden's capital a' is the wordplay.
'poems' becomes 'odes' (ode is a kind of poem**).
'about' indicates putting letters inside.
'capital' suggests taking the first letters.
The first letter of 'sweden' is 's'.
'odes' going around 's' is 'odess'.
'odess'+'a'='ODESSA'
(Other definitions for odessa that I've seen before include "Ukrainian Black Sea port" , "Battleship Potemkin mutiny port" , "Do seas come into Ukrainian city?" , "Port city on the Black Sea" , "Black Sea location" .)