Book before Nahum (5)
I believe the answer is:
micah
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">book before nahum</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 micah that I've seen before include "Old Testament prophet" , "Old Testament book" , "set of books" , "Hebrew prophet; OT book" , "Bookmaker" .)