Society invested in remedy for affliction (5)
I believe the answer is:
curse
'affliction' is the definition.
(I know that curse is a type of affliction)
'society invested in remedy' is the wordplay.
'society' becomes 's' (common abbreviation in names of organisations).
'invested in' indicates putting letters inside.
'remedy' becomes 'cure' (synonyms).
's' inserted inside 'cure' is 'CURSE'.
'for' acts as a link.
(Other definitions for curse that I've seen before include "It's bad spelling" , "Invoke evil upon" , "Imprecate" , "Oath or a call for evil to come upon person" , "Evil spell - oath" .)