Party sends American from residence in defeated state (7)
I believe the answer is:
hoedown
'party' is the definition.
(I've seen this before)
'american from residence in defeated state' is the wordplay.
'american' becomes 'us' (abbreviation for United States).
'from' suggests deleting specific letters.
'residence' becomes 'house' (house is a type of residence).
'in defeated state' becomes 'down' (I can't justify this - if you can you should believe this answer much more).
'house' with 'us' removed is 'hoe'.
'hoe'+'down'='HOEDOWN'
'sends' is the link.
Can you help me to learn more?
(Other definitions for hoedown that I've seen before include "Barn-dance" , "Woodhen (anag.)" , "American country dance" , "Square dance" , "US country dance" .)