Barber's razor sharpener (5)
I believe the answer is:
strop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">barber's razor 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 "rage" , "wobbly" , "Fit of bad temper" , "Sharpen an old blade" , "temper tantrum" .)