Slight cold (7)
I believe the answer is:
sniffle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">slight cold</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sniffle that I've seen before include "A little cold" , "Breathe in, as when having a cold" , "Mild cold" , "Sign of a cold?" , "Slight head cold" .)