Small railway station (4)
I believe the answer is:
halt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small railway station</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for halt that I've seen before include "Cease" , "game" , "Small railway station" , "Bring to a stop; lame" , "Stop, small station" .)