Crossword Genius

South American native that’s on slippery slope (5)

Ross

I believe the answer is:

scree

'that's on slippery slope' is the definition.
(rocks on a mountain slope)

'south american native' is the wordplay.
'south' becomes 'S' (abbreviation).
'american native' becomes 'cree' (Native American).
's'+'cree'='SCREE'

(Other definitions for scree that I've seen before include "Sloping mass of rocks at the base of a cliff" , "Loose stones around a mountain" , "Rock debris at the base of a cliff" , "Steep, stony slope" , "Loose debris on a mountain slope" .)

I've seen this clue in The Times.
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