Exhausting hike (4)
I believe the answer is:
slog
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exhausting hike</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for slog that I've seen before include "Make a wild cricket stroke" , "Hit hard - hard work" , "Work doggedly" , "Very tiring work" , "Wild cricket hit" .)