Gentle swab for treatment somewhere in India (4,6)

I believe the answer is:

west bengal

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'gentle swab for treatment somewhere in india' is the definition.
I can't judge whether this definition defines the answer.

'gentle swab for treatment' is the wordplay.
'for treatment' indicates an anagram (the anagram must be processed or treated).
'gentle'+'swab'='gentleswab'
'gentleswab' anagrammed gives 'WEST BENGAL'.

Can you help me to learn more?

(Another definition for west bengal that I've seen is " State of India".)

I've seen this clue in The Everyman puzzle in The Observer.

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