Friendship dear America ruined (11)
I believe the answer is:
camaraderie
'friendship' is the definition.
(camaraderie is friendship or companionship)
'dear america ruined' is the wordplay.
'ruined' indicates anagramming the letters.
'dear'+'america'='dearamerica'
'dearamerica' anagrammed gives 'CAMARADERIE'.
(Other definitions for camaraderie that I've seen before include "Esprit de corps" , "Comradeship" , "Mutual trust and friendship" , "Main theme of Friends" , "Friendly sociability" .)