Poem fool picked up in Ukrainian city (6)
I believe the answer is:
odessa
'ukrainian city' is the definition.
(I've seen this before)
'poem fool picked up' is the wordplay.
'poem' becomes 'ode' (ode is a kind of poem).
'fool' becomes 'ass' (both can mean a stupid person).
'picked up' says the letters should be written in reverse.
'ass' reversed gives 'ssa'.
'ode'+'ssa'='ODESSA'
'in' acts as a link.
(Other definitions for odessa that I've seen before include "Ukrainian location" , "Ukrainian naval base" , "Ukrainian Black Sea port" , "Battleship Potemkin mutiny port" , "Seaport" .)