Discuss again and again (6)
I believe the answer is:
rehash
'discuss again and again' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rehash that I've seen before include "Serve up old ideas" , "Use old material in a new form" , "Makeover" , "makeshift changes?" , "Same material, different mix" .)