High-pitched and sharp (6)
I believe the answer is:
shrill
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">high-pitched and sharp</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 shrill that I've seen before include "Ear-piercing" , "High pitched" , "High and piercing" , "Keen" , "Strident" .)