South American resident's car opened endlessly (10)

I believe the answer is:

jaguarundi

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'south american resident's car opened endlessly' is the definition.
I can't tell whether this definition defines the answer.

'car opened endlessly' is the wordplay.
'car' becomes 'jaguar' (I have seen 'posh car' mean 'jaguar' so perhaps 'car' could also mean 'jaguar').
'opened endlessly' becomes 'undi' (I can't justify this - if you can you should believe this answer much more).
'jaguar'+'undi'='JAGUARUNDI'

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I've seen this clue in The Telegraph.

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