Barber's sharpener (5)
I believe the answer is:
strop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">barber's sharpener</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for strop that I've seen before include "Razor-sharpener" , "Display of temper" , "Razor sharpener" , "Prime cutthroat" , "fit of anger" .)