Without conductor's lead, play it badly, as usual (7)
I believe the answer is:
typical
'usual' is the definition.
(thesaurus)
'without conductor's lead play it badly' is the wordplay.
'without' is an insertion indicator.
'lead' says to take the initial letters.
'badly' is an anagram indicator.
The first letter of 'conductors' is 'c'.
'play'+'it'='playit'
'playit' with letters rearranged gives 'typial'.
'c' going into 'typial' is 'TYPICAL'.
'as' acts as a link.
(Other definitions for typical that I've seen before include "Stock" , "routine" , "Characteristic (of someone/something)" , "Representative, standard" , "Archetypal" .)