Regina prepared to tour India, a Commonwealth country (7)

I believe the answer is:

nigeria

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

'a commonwealth country' is the definition.
'Nigeria' can be an answer for 'country' (Nigeria is an example). I'm not certain of the 'a commonwealth' bit.

'regina prepared to tour india' is the wordplay.
'prepared' is an anagram indicator.
'to tour' means one lot of letters goes inside another (to tour can mean to go around).
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'regina' is an anagram of 'nigera'.
'nigera' placed around 'i' is 'NIGERIA'.

Can you help me to learn more?

(Other definitions for nigeria that I've seen before include "West African nation" , "W. African country" , "West African state" , "West African country, capital Lagos" , "Country bordered by Benin, Niger, Chad, and Cameroon" .)

I've seen this clue in The Independent.

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