Crossword Genius

Give old teacher weapons for the great war? (10)

Ross

I believe the answer is:

armageddon

I'm a little stuck... Click here to teach me more about this clue!

'war?' is the definition.
(I have seen 'Terrible war' mean 'armageddon' so perhaps 'war' could also mean 'armageddon')

'give old teacher weapons for the great' is the wordplay.
I cannot quite understand how this works, but
'old' could be 'aged' (similar in meaning) and 'aged' is found in the answer.
'teacher' could be 'don' (don can mean an academic - especially at Oxbridge) and 'don' is present in the answer.
The remaining letters 'arm' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for armageddon that I've seen before include "Apocalyptic battle" , "large-scale fighting" , "complete disaster" , "terminal struggle" , "large-scale conflict" .)

I've seen this clue in the Sydney Morning Herald.
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