Simple Harry Houdini act with steps (15)
I believe the answer is:
unsophisticated
'simple' is the definition.
(I've seen this before)
'harry houdini act with steps' is the wordplay.
'harry' indicates an anagram (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'houdini'+'act'='houdiniact'
'houdiniact' put after 'steps' is 'stepshoudiniact'.
'stepshoudiniact' is an anagram of 'UNSOPHISTICATED'.
(Other definitions for unsophisticated that I've seen before include "crude" , "Simple" , "green" , "Lacking experience" , "straightforward" .)