Epic journey (7)
I believe the answer is:
odyssey
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">epic journey</span>' is the definition.<br/ ><span class="explanation-format__explanation">(journey taken by Odysseus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for odyssey that I've seen before include "Epic poem - epic voyage" , "A long adventurous journey - see Homer" , "Homer's epic poem" , "Greek epic on the wanderings of Ulysses" , "Homerian epic" .)