The appearance of endless crisis beginning to extend (9)
I believe the answer is:
emergence
'the appearance' is the definition.
(emergence is a kind of appearance)
'of endless crisis beginning to extend' is the wordplay.
'of endless' means to remove the last letter (I've seen 'endless' mean this).
'crisis' becomes 'emergency' (emergency is a kind of crisis).
'beginning to' says to take the initial letters.
The initial letter of 'extend' is 'e'.
'emergency' with its last letter taken away is 'emergenc'.
'emergenc'+'e'='EMERGENCE'
(Other definitions for emergence that I've seen before include "rise" , "A coming forth" , "First appearance" , "Advent" , "Sudden appearance" .)