Maybe Methuselah cracked almond (3,3)
I believe the answer is:
old man
'maybe methuselah' is the definition.
I can't tell whether this definition defines the answer.
'cracked almond' is the wordplay.
'cracked' is an anagram indicator.
'almond' anagrammed gives 'OLD MAN'.
Can you help me to learn more?
(Other definitions for old man that I've seen before include "Informal name for father, husband or ship's captain" , "Husband (inf)" , "Husband - father - boss" , "Aged male as informal father" , "Elderly chap" .)