Right, has he used same old material again? (6)
I believe the answer is:
rehash
'right has he used same old material again?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'right has he used' is the wordplay.
'right' becomes 'r' (common abbreviation).
'used' indicates anagramming the letters.
'has'+'he'='hashe'
'hashe' with letters rearranged gives 'ehash'.
'r'+'ehash'='REHASH'
Can you help me to learn more?
(Other definitions for rehash that I've seen before include "Use old material in a new form" , "Makeover" , "Re-use old material with little or no change" , "Present again with just the odd change" , "Serve up old ideas" .)