Literature both old and new (10,5)
I believe the answer is:
historical novel
'literature both' is the definition.
I can't tell whether this definition defines the answer.
'old and new' is the wordplay.
'old' becomes 'historical'.
'and' says to put letters next to each other.
'new' becomes 'novel' (similar in meaning).
'historical'+'novel'='HISTORICAL NOVEL'
Can you help me to learn more?
(Other definitions for historical novel that I've seen before include "work of literature" , "work of fiction" .)