Poems as returned to Ukrainian port (6)
I believe the answer is:
odessa
'ukrainian port' is the definition.
(I've seen this in another clue)
'poems as returned' is the wordplay.
'poems' becomes 'odes' (ode is a kind of poem).
'returned' says the letters should be written in reverse.
'as' back-to-front is 'sa'.
'odes'+'sa'='ODESSA'
'to' is the link.
(Other definitions for odessa that I've seen before include "Ukrainian location" , "Seaport" , "Port city of Ukraine" , "Ukrainian naval base" , "Do seas come into Ukrainian city?" .)