Inept type, one playing outside entrance to nightclub (7)
I believe the answer is:
bungler
'inept type' is the definition.
'one playing outside entrance to nightclub' is the wordplay.
'one playing' becomes 'bugler' (person playing a bugle).
'outside' indicates putting letters inside.
'entrance to' says to take the initial letters.
The first letter of 'nightclub' is 'n'.
'bugler' enclosing 'n' is 'BUNGLER'.
(Other definitions for bungler that I've seen before include "One prone to error" , "Clumsy executant" , "Clumsy incompetent" , "Someone prone to getting it wrong" .)