Before a party, rent Twister (7)
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I believe the answer is:
tornado
'twister' is the definition.
(term for a tornado)
'before a party rent' is the wordplay.
'before' says to put letters next to each other.
'party' becomes 'do' (do can informally mean a party).
'rent' becomes 'torn' (synonyms).
'a'+'do'='ado'
'ado' after 'torn' is 'TORNADO'.
(Other definitions for tornado that I've seen before include "Typhoon" , "Tempest'" , "Strong wind" , "Funnel-shaped windstorm" , "great deal of wind" .)