Community also developed outside Channel Islands (6)
I believe the answer is:
social
'community' is the definition.
(thesaurus)
'also developed outside channel islands' is the wordplay.
'developed' indicates an anagram.
'outside' is an insertion indicator.
'channel islands' becomes 'ci'.
'also' anagrammed gives 'soal'.
'soal' placed around 'ci' is 'SOCIAL'.
(Other definitions for social that I've seen before include "Relating to society" , "Friendly - party" , "Outgoing, extroverted" , "Public servant caring for the underprivileged" , "Relating to people living in groups" .)