A carer aimed for treatment from fellowship (11)
I believe the answer is:
camaraderie
'fellowship' is the definition.
(thesaurus)
'a carer aimed for treatment' is the wordplay.
'for treatment' is an anagram indicator (I've seen this in other clues).
'a'+'carer'+'aimed'='acareraimed'
'acareraimed' with letters rearranged gives 'CAMARADERIE'.
'from' is the link.
(Other definitions for camaraderie that I've seen before include "Esprit de corps" , "Fellowship" , "Friendly sociability" , "Mutual trust and friendship" , "all that backslapping?" .)