Crossword Genius

Twister split American party (7)

Ross

I believe the answer is:

tornado

'twister' is the definition.
(term for a tornado)

'split american party' is the wordplay.
'split' becomes 'torn' (I've seen this in other clues).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'party' becomes 'do' (do can informally mean a party).
'torn'+'a'+'do'='TORNADO'

(Other definitions for tornado that I've seen before include "lot of wind" , "wind-up" , "A violent and destructive whirlwind" , "Destructive weather" , "Tempest'" .)

I've seen this clue in The Independent.
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