Religious leader not about to speak at length (6,2)
I believe the answer is:
rabbit on
'speak at length' is the definition.
'rabbit on' can be an answer for 'speak' (rabbiting on is a kind of speaking). I am not certain of the 'at length' bit.
'religious leader not about' is the wordplay.
'religious leader' becomes 'rabbi' (Jewish religious leader).
'about' says the letters should be written backwards.
'not' backwards is 'ton'.
'rabbi'+'ton'='RABBIT ON'
'to' is the link.
Can you help me to learn more?
(Other definitions for rabbit on that I've seen before include "waffle" , "talk at length" , "Chatter" .)