Boring bit (5)
I believe the answer is:
auger
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">boring bit</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 auger that I've seen before include "Tool with spiral point for boring" , "Boring-tool" , "I bore" , "Boring instrument" , "something that's boring" .)