Greek alphabet ender (5)
I believe the answer is:
omega
'greek alphabet ender' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for omega that I've seen before include "End of sequence" , "letter to Greeks" , "The last in a series of letters" , "Greek long 'o'" , "Art of story-telling by body movement" .)