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