Wise men consider accepting street justice (10)
I believe the answer is:
magistrate
'justice' is the definition.
('magistrate' can be a synonym of 'justice')
'wise men consider accepting street' is the wordplay.
'wise men' becomes 'magi' (I've seen this before).
'consider' becomes 'rate' (I've seen this before).
'accepting' means one lot of letters goes inside another.
'street' becomes 'st'.
'magi'+'rate'='magirate'
'magirate' going around 'st' is 'MAGISTRATE'.
(Other definitions for magistrate that I've seen before include "Dispenser of justice" , "Law enforcer" , "Person in court" , "Judge" , "Court head" .)