Wise men consider crossing street seeing one on bench (10)
I believe the answer is:
magistrate
'one on bench' is the definition.
'wise men consider crossing street' is the wordplay.
'wise men' becomes 'magi' (I've seen this before).
'consider' becomes 'rate' (I've seen this before).
'crossing' means one lot of letters goes inside another.
'street' becomes 'st'.
'magi'+'rate'='magirate'
'magirate' going around 'st' is 'MAGISTRATE'.
'seeing' is the link.
(Other definitions for magistrate that I've seen before include "Court officer" , "Justice of the peace" , "Court head" , "Capital of Ethiopia" , "Person in court" .)