Country song ultimately about nothing (7)

I believe the answer is:

grenada

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'country' is the definition.
(Grenada is an example)

'song ultimately about nothing' is the wordplay.
'song ultimately' becomes 'erg' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' is a reversal indicator.
'nothing' becomes 'nada' (synonyms).
'erg' backwards is 'gre'.
'gre'+'nada'='GRENADA'

Can you help me to learn more?

(Other definitions for grenada that I've seen before include "West Indian island" , "Dare nag go to the West Indies?" , "Island state in the West Indies" , "A garden (anag) - Caribbean island" , "West Indian country" .)

I've seen this clue in The Daily Express.

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