One blowing rent on a party (7)

I believe the answer is:
tornado
'one blowing' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'rent on a party' is the wordplay.
'rent' becomes 'torn' (synonyms).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'party' becomes 'do' (do can informally mean a party).
'torn'+'a'+'do'='TORNADO'
Can you help me to learn more?
(Other definitions for tornado that I've seen before include "A major blow" , "Violent whirlwind over land" , "Donator of fierce wind" , "Road not turned in the windstorm" , "RAF fighter; whirlwind" .)
