Utopian novel of 1872 (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">utopian novel of 1872</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 erewhon that I've seen before include "Satirical novel" , "LITERATURE" , "Book by Samuel Butler" , "Samuel Butler's utopian satire" , "Samuel Butler's utopia" .)