Father of Methuselah (5)
I believe the answer is:
enoch
'father of methuselah' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enoch that I've seen before include "Man in Bible" , "greatly honoured" , "Biblical character" , "-- Powell, former politician" , "Cain's eldest son - Methuselah's father" .)