In-flight announcement, briefly (3)
I believe the answer is:
eta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in-flight announcement briefly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eta that I've seen before include "When you'd expect to see" , "European separatists, initially" , "Arrival roughly indicated" , "giving expected termination of journey" , "Something like 10 [RHO]" .)