Scotsmen supporting Independent American statesman? (9)

I believe the answer is:

indianian

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

'scotsmen supporting independent' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'american statesman?' is the wordplay.
'american' becomes 'indian' (Indian is an example).
'statesman?' becomes 'ian' (I am not sure about this - if you are sure you should believe this answer much more).
'indian'+'ian'='INDIANIAN'

Can you help me to learn more?

I've seen this clue in The Independent.

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