Certainly not beginning to heckle Japanese drama (3)
I believe the answer is:
noh
'japanese drama' is the definition.
(type of drama in Japan)
'certainly not beginning to heckle' is the wordplay.
'certainly not' becomes 'no'.
'beginning to' suggests taking the first letters.
The initial letter of 'heckle' is 'h'.
'no'+'h'='NOH'
(Other definitions for noh that I've seen before include "Japanese drama form" , "Arkwright" , "Sort of drama" , "Japanese dramas" , "Traditional Japanese stage drama" .)