Shortness of sight (6)
I believe the answer is:
myopia
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">shortness of sight</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for myopia that I've seen before include "complaint" , "vision problem" , "lack of long-term vision" , "Short-sightedness" , "Near-sightedness" .)