Poetry written by river - this one in Germany? (4)
I believe the answer is:
oder
'this one in germany?' is the definition.
('Oder' is part of 'germany')
'poetry written by river' is the wordplay.
'poetry' becomes 'ode' (I've seen this before).
'written by' is a charade indicator (letters next to each other).
'river' becomes 'r'.
'ode'+'r'='ODER'
(Other definitions for oder that I've seen before include "waterway" , "River on border of Poland and Germany" , "flowing water" , "River that, with the Neisse, forms the German-Polish border" , "School blazer insignia" .)