Where Marie Curie was born (6)
I believe the answer is:
'where marie curie was born' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for poland that I've seen before include "Country joining the European Union in 2004" , "East European country" , "Old pan (anag)" , "in E" , "Chopin's homeland" .)