Twister's confused Ron at party (7)
I believe the answer is:
tornado
'twister's' is the definition.
('tornado' can be a synonym of 'twister')
'confused ron at party' is the wordplay.
'confused' indicates anagramming the letters.
'party' becomes 'do' (do is a kind of party).
'ron'+'at'='ronat'
'ronat' with letters rearranged gives 'torna'.
'torna'+'do'='TORNADO'
(Other definitions for tornado that I've seen before include "Whirling storm" , "wind-up" , "Funnelling wind" , "Donator of fierce wind" , "Violent swirling wind" .)