Work the man's displayed in street as a philosopher (7)
I believe the answer is:
sophist
'a philosopher' is the definition.
(thesaurus)
'work the man's displayed in street' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'the man's' becomes 'his' (I've seen this before).
'displayed in' indicates putting letters inside.
'street' becomes 'st'.
'op'+'his'='ophis'
'ophis' inserted into 'st' is 'SOPHIST'.
'as' is the link.
(Other definitions for sophist that I've seen before include "Clever but fallacious reasoner" , "One using clever but fallacious arguments" , "One given to specious reasoning" , "One who uses clever but false argument" , "philosopher" .)