Society with a site developed for rest (6)
I believe the answer is:
siesta
'rest' is the definition.
(thesaurus)
'society with a site developed' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'with' is a charade indicator (letters next to each other).
'developed' indicates anagramming the letters.
'a'+'site'='asite'
'asite' anagrammed gives 'iesta'.
's'+'iesta'='SIESTA'
'for' acts as a link.
(Other definitions for siesta that I've seen before include "Daytime nap" , "Rest of Spain" , "Catnap" , "Early afternoon nap" , "Spanish afternoon nap" .)