State in India harboured revolutionary circle (5)

I believe the answer is:

idaho

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'state' is the definition.
(US state)

'india harboured revolutionary circle' is the wordplay.
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'harboured revolutionary' becomes 'dah' (I can't explain this - if you can you should believe this answer much more).
'circle' becomes 'O' (O is a circle).
'i'+'dah'+'o'='IDAHO'

'in' is the link.

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(Other definitions for idaho that I've seen before include "somewhere in the US" , "State of northwest US" , "43rd US state" , "The Gem State (US)" , "US state E. of Oregon" .)

I've seen this clue in The Independent.

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