A river Earth's no longer in shock about (6)
I believe the answer is:
amazon
'a river' is the definition.
(Amazon is an example)
'earth's no longer in shock about' is the wordplay.
I cannot really see how this works, but
'no' could be 'z' and 'z' is located in the answer.
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
The remaining letters 'ama' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for amazon that I've seen before include "Great river of S America, or a tough woman" , "Aggressive female" , "S. America's longest river" , "tropical fish swimming here" , "River in South America" .)