Discover South American's excluded

I believe the answer is:

sussout

'discover' is the definition.
(I've seen this before)

'south american's excluded' is the wordplay.
'south' becomes 'S' (synonyms).
'american's' becomes 'us's' (abbreviation for United States).
'excluded' becomes 'out' (I've seen this before).
's'+'uss'+'out'='SUSS OUT'

I've seen this clue in The Daily Mail.

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