Teacher not coming back to waffle (6,2)
I believe the answer is:
rabbit on
'waffle' is the definition.
(I've seen this before)
'teacher not coming back' is the wordplay.
'teacher' becomes 'rabbi' (Jewish teacher).
'coming back' says the letters should be written in reverse.
'not' in reverse letter order is 'ton'.
'rabbi'+'ton'='RABBIT ON'
'to' acts as a link.
(Other definitions for rabbit on that I've seen before include "waffle" , "talk at length" , "Chatter" .)