Step over wise guy in corridor (7)
I believe the answer is:
passage
'corridor' is the definition.
(thesaurus)
'step over wise guy' is the wordplay.
'step' becomes 'pas' (I've seen this before).
'over' is a charade indicator (letters next to each other).
'wise guy' becomes 'sage'.
'pas'+'sage'='PASSAGE'
'in' is the link.
(Other definitions for passage that I've seen before include "Sea or air journey" , "Alley - corridor" , "Section of musical or literary work" , "Piece of writing" , "Piece of text or music" .)