Crossword Genius

Presumption following country's downfall, naturally (8)

Ross

I believe the answer is:

landslip

'downfall naturally' is the definition.
(term for a landslide)

'presumption following country's' is the wordplay.
'presumption' becomes 'lip' (lip can mean presumptuous behaviour).
'following' is a charade indicator (letters next to each other).
'country's' becomes 'land's' ('land' can be a synonym of 'country').
'lip' put after 'lands' is 'LANDSLIP'.

(Other definitions for landslip that I've seen before include "Fall of earth, stones, etc down slope" , "Rockfall" , "Earth movement" , "Avalanche" .)

I've seen this clue in The Times.
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