Underground worker (5)
I believe the answer is:
miner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">underground worker</span>' is the definition.<br/ ><span class="explanation-format__explanation">(someone working underground in a mine)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for miner that I've seen before include "Person who works underground" , "One works underground" , "One who digs for ore" , "Man of 49" , "One sent down for work" .)