Beep on a beeper (4)
I believe the answer is:
page
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">beep on a beeper</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 page that I've seen before include "a significant bit of history?" , "Young attendant for part of a book" , "contribution to book?" , "Section of biography perhaps" , "one seeking knighthood" .)