Last book of the Old Testament (7)
I believe the answer is:
malachi
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">last book of the old testament</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 malachi that I've seen before include "Biblical prophet" , "Hebrew prophet; OT book" , "8, Book 39" , "Old Testament prophet" , "Part of Bible" .)