Once more, the great man's "not out” (5)

I believe the answer is:

again

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'once more' is the definition.
(synonyms)

'great man's not out' is the wordplay.
'great man' becomes 'aga' (I can't explain this - if you can you should believe this answer much more).
'not out' becomes 'in' ('in' is the opposite to 'out').
'aga'+'in'='AGAIN'

'the' is the link.

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(Other definitions for again that I've seen before include "Furthermore" , "Ocne more" , "Anew" , "Repeatedly" , "One more time, encore" .)

I've seen this clue in the Evening Standard.

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