Give everything away (4)
I believe the answer is:
blab
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">give everything away</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 blab that I've seen before include "Shoot one's mouth off" , "Tells tales" , "Give the game away" , "Talk indiscreetly" , "Tell tales" .)