Crossword Genius

Success in later life of mathematician from South Asia? (6,6)

Ross

I believe the answer is:

indian summer

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

'south asia?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'success in later life of mathematician' is the wordplay.
'success in later life of' becomes 'indian' (I can't justify this - if you can you should believe this answer much more).
'mathematician' becomes 'summer' (I've seen this before).
'indian'+'summer'='INDIAN SUMMER'

'from' is the link.

Can you help me to learn more?

(Other definitions for indian summer that I've seen before include "counter-wallah" , "when it is unusually warm" , "Warm period in autumn" , "Welcome warmth" , "Late heatwave" .)

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