Poorer fretted outside society (5)
I believe the answer is:
worse
'poorer' is the definition.
(in a more poor condition)
'fretted outside society' is the wordplay.
'fretted' becomes 'wore' (fret can mean to wear away).
'outside' means one lot of letters goes inside another.
'society' becomes 's' (common abbreviation in names of organisations).
'wore' placed around 's' is 'WORSE'.
(Other definitions for worse that I've seen before include "More serious" , "less moral?" , "Bad to a greater degree" , "Less favourable" , "More awful or unwell" .)