Appearance of endless crisis on energy (9)
I believe the answer is:
emergence
'appearance' is the definition.
(I know that emergence is a type of appearance)
'endless crisis on energy' is the wordplay.
'endless' means to remove the last letter.
'crisis' becomes 'emergency' (emergency is a kind of crisis).
'on energy' becomes 'e' (I can't explain this - if you can you should believe this answer much more).
'emergency' with its final letter taken away is 'emergenc'.
'emergenc'+'e'='EMERGENCE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for emergence that I've seen before include "A coming forth" , "Advent" , "rise" , "Development" , "First appearance" .)