Take back hypocritical talk in lessons about religion (6)
I believe the answer is:
recant
'take back' is the definition.
(thesaurus)
'about religion' is the wordplay.
'about' becomes 're' (regarding).
'religion' becomes 'cant' (I am not sure about this - if you are sure you should believe this answer much more).
're'+'cant'='RECANT'
'hypocritical talk in lessons' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for recant that I've seen before include "Retract opinion" , "Take back in canter" , "Go back on a statement of belief" , "Abjure, forswear" , "Publicly withdraw" .)