Horrible tangerine, one from S America (9)

I believe the answer is:

argentine

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'one from s america' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'horrible tangerine' is the wordplay.
'horrible' indicates an anagram.
'tangerine' anagrammed gives 'ARGENTINE'.

Can you help me to learn more?

(Other definitions for argentine that I've seen before include "National" , "South American" , "silvery" , "from South America" , "like silver" .)

I've seen this clue in The Times.

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