Land fish on film next to river (6)
I believe the answer is:
rwanda
'land' is the definition.
(Rwanda is an example)
'fish on film next to river' is the wordplay.
'fish on film' becomes 'wanda' (reference to the film A Fish Called Wanda).
'next to' means one lot of letters go next to another.
'river' becomes 'r' (abbreviation).
'wanda' after 'r' is 'RWANDA'.
(Other definitions for rwanda that I've seen before include "Language" , "Republic in central Africa" , "Nation" , "Hutu and Tutsi country" , "African state" .)