Closeness from dear America's uncertain (11)
I believe the answer is:
camaraderie
'closeness' is the definition.
(camaraderie is a kind of closeness)
'dear america's uncertain' is the wordplay.
'uncertain' indicates an anagram.
'dear'+'america'='dearamerica'
'dearamerica' is an anagram of 'CAMARADERIE'.
'from' is the link.
(Other definitions for camaraderie that I've seen before include "Friendly feeling" , "Esprit de corps" , "Fellowship" , "all that backslapping?" , "Spirit of friendliness and trust" .)