Awaiting endless details (4)
I believe the answer is:
info
'details' is the definition.
(short for information)
'awaiting endless' is the wordplay.
'awaiting' becomes 'in for' (I've seen this in another clue).
'endless' means to remove the last letter.
'infor' with its final letter taken away is 'INFO'.
(Other definitions for info that I've seen before include "Intelligence (abbr)" , "Knowledge (colloq.)" , "What's known" , "News" , "Data received and understood (abbr)" .)