Methuselah's father (5)
I believe the answer is:
enoch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">methuselah's father</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 enoch that I've seen before include "Biblical character" , "OT patriarch" , "Old Testament figure" , "Oldest city father" , "-- Powell, former politician" .)