Song mostly probing a writer’s devastation (10)
I believe the answer is:
apocalypse
'song mostly probing a writer's devastation' is the definition.
I can't judge whether this definition defines the answer.
'song mostly probing a writer's devastation' is the wordplay.
'song' becomes 'calypso' (I've seen this before).
'mostly' means to remove the last letter.
'probing' means one lot of letters goes inside another (probe can mean to make a hole in).
'a writer's devastation' becomes 'apoe' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'calypso' with its final letter taken off is 'calyps'.
'calyps' placed within 'apoe' is 'APOCALYPSE'.
Can you help me to learn more?
(Other definitions for apocalypse that I've seen before include "prophetic disclosure" , "End of the world" , "Catastrophic event" , "Revelation" , "the last item" .)