Pop to Methuselah's place, finally, and see if he's in for callers? (5)
I believe the answer is:
enoch
'he's in for callers?' is the definition.
'Enoch' can be an answer for 'he's'. I'm unsure of the 'in for callers?' bit.
'pop to methuselah's place finally and see' is the wordplay.
'pop' indicates anagramming the letters (I've seen 'popping' mean this (the original order pops or explodes)).
'finally' suggests the final letters.
'and' becomes 'n' (common abbreviation for 'and').
'see' becomes 'C' (the word for the letter, according to Chambers).
The last letters of 'to methuselah place' are 'ohe'.
'ohe'+'n'+'c'='ohenc'
'ohenc' with letters rearranged gives 'ENOCH'.
'if' is the link.
Can you help me to learn more?
(Other definitions for enoch that I've seen before include "Son of murderer" , "greatly honoured" , "OT patriarch" , "Oldest city father" , "Man in Bible" .)