Concealed in primrose paths dug up in Cuban capital (4)

I believe the answer is:

peso

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'cuban capital' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'concealed in primrose paths dug up' is the wordplay.
'concealed in' indicates a hidden word.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'osep' is hidden in the letters of 'primrose paths dug'.
'osep' backwards is 'PESO'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for peso that I've seen before include "Mexican currency unit" , "Chilean currency" , "Currency of Mexico" , "Mexican coin" , "Foreign currency" .)

I've seen this clue in The Irish Times.

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