Book before Amos (4)
I believe the answer is:
joel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">book before amos</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 joel that I've seen before include "Book of minor prophet" , "book in church" , "Old Testament prophet" .)