Trekker (5)
I believe the answer is:
hiker
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">trekker</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hiker that I've seen before include "Person on long walk" , "Backpacker" , "Foot traveller" , "Walker for pleasure" , "Trekker" .)