Detrain (6)
I believe the answer is:
alight
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">detrain</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alight that I've seen before include "Get out of train" , "Land; on fire" , "Come to rest on the ground" , "suffering from arson attack?" , "(Of bird) settle" .)