Member meets elderly fellow in final showdown (10)
I believe the answer is:
armageddon
'final showdown' is the definition.
The definition suggests a singular noun which matches the answer.
'member meets elderly fellow' is the wordplay.
'member' becomes 'arm' (member can mean a limb).
'meets' says to put letters next to each other.
'elderly' becomes 'aged' (synonyms).
'fellow' becomes 'don' (both can mean an academic).
'arm'+'aged'+'don'='ARMAGEDDON'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for armageddon that I've seen before include "complete disaster" , "bloody battle" , "Biblical battle" , "Apocalyptic battle" , "Ultimate scrap" .)