World of society in care of doctors (6)
I believe the answer is:
cosmos
'world' is the definition.
(synonyms)
'society in care of doctors' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'in' is an insertion indicator.
'care of' becomes 'co' (c/o can mean 'care of' when addressing mail).
'doctors' becomes 'mos'.
'co'+'mos'='comos'
's' going within 'comos' is 'COSMOS'.
'of' is the link.
(Other definitions for cosmos that I've seen before include "The universe - a daisy" , "Universe seen as a whole" , "Universe as an ordered system" , "The universe, whole of creation" , "The entire universe." .)