A raider came to rock friendly feeling (11)
I believe the answer is:
camaraderie
'friendly feeling' is the definition.
(I've seen this before)
'a raider came to rock' is the wordplay.
'to rock' indicates an anagram.
'a'+'raider'+'came'='araidercame'
'araidercame' is an anagram of 'CAMARADERIE'.
(Other definitions for camaraderie that I've seen before include "Fellowship" , "Main theme of Friends" , "Esprit de corps" , "Friendly feeling" , "all that backslapping?" .)