Railway worker (9)
I believe the answer is:
signalman
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">railway worker</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that signalman is a type of railway worker)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for signalman that I've seen before include "one controlling traffic movement" , "Rail worker" , "Railway worker" , "Main slang (anag.)" , "Railway employee controlling points" .)