It's permitted in all egalitarian societies (5)
I believe the answer is:
legal
'it's permitted' is the definition.
(I've seen this before)
'in all egalitarian societies' is the wordplay.
'in' says the answer is hidden in the clue.
'LEGAL' is hidden in the letters of 'all egalitarian societies'.
(Other definitions for legal that I've seen before include "Compliant with the law" , "not banned" , "Above board" , "within the rules" , "Authorised" .)