Wake-up bugle call (8)
I believe the answer is:
reveille
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wake-up bugle call</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for reveille that I've seen before include "Military wake-up call" , "Rousing bugle-call" , "Military signal to wake up" , "Early morning sound in the barracks" , "Morning call" .)