Not watertight (5)
I believe the answer is:
leaky
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not watertight</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 leaky that I've seen before include "Not watertight" , "Letting gas/liquid out" , "Divulging secrets" , "Perforated" , "Unable to keep secrets" .)