Crossword Genius

Long haul

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long haul</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 trek that I've seen before include "A long arduous march" , "Extended journey" , "Long hard journey on foot" , "Slog" , "Difficult journey on foot" .)

I've seen this clue in the LA Times, The Wall Street Journal and the Newsday.
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