Give ancient collegian weapons for the ultimate war (10)
I believe the answer is:
armageddon
'war' is the definition.
(I have seen 'Terrible war' mean 'armageddon' so perhaps 'war' could also mean 'armageddon')
'give ancient collegian weapons for the ultimate' is the wordplay.
I cannot really see how this works, but
'ancient' could be 'aged' (ancient can mean very aged) and 'aged' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for armageddon that I've seen before include "Biblical battle" , "large-scale fighting" , "final battle" , "large-scale conflict" , "Ultimate scrap" .)