Keep stunning shot of English river (6)
I believe the answer is:
amazon
'river' is the definition.
(Amazon is an example)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for amazon that I've seen before include "Brazilian river" , "Strong, well-built woman" , "big river" , "Female warrior of Greek myth" , "River in South America" .)