Pilot's announcement, for short (3)
I believe the answer is:
eta
'pilot's announcement for short' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eta that I've seen before include "Arrival roughly indicated" , "when it might reach us?" , "Something like 10 [RHO]" , "When one is due" , "Basque separatist movement" .)