Spittle (6)
I believe the answer is:
saliva
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spittle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for saliva that I've seen before include "Mouth secretion" , "Spit" , "Clear liquid secreted into the mouth" , "Fluid in the mouth" , "body fluid" .)