One way to maintain vigour in the country (7)

I believe the answer is:

ireland

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'country' is the definition.
(Ireland is a country)

'one way to maintain vigour in the' is the wordplay.
'one' becomes 'i' (Roman numeral).
'way' becomes 'rd' (short for road).
'to maintain vigour' becomes 'elan' (I can't explain this - if you can you should give a lot more credence to this answer).
'in the' means one lot of letters goes inside another.
'rd' going around 'elan' is 'reland'.
'i'+'reland'='IRELAND'

Can you help me to learn more?

(Other definitions for ireland that I've seen before include "An idler (anag)" , "Eng. composer, country" , "Hibernia" , "Country west of Wales" , "State" .)

I've seen this clue in The Guardian.

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