Harshness of manner (8)
I believe the answer is:
asperity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">harshness of manner</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 asperity that I've seen before include "Irritability" , "Harshness or severity of manner" , "Harshness, bitter coldness" , "Roughness of temper" , "Roughness, bitterness" .)