Old papers in many cases (8)
I believe the answer is:
ofttimes
'old papers' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'many cases' is the wordplay.
'many' becomes 'oft' (I can't justify this - if you can you should believe this answer much more).
'cases' becomes 'times' (time is a kind of case).
'oft'+'times'='OFTTIMES'
'in' acts as a link.
Can you help me to learn more?
(Another definition for ofttimes that I've seen is " Frequently, at short intervals (arch/poetic)".)