The same ludicrous papers sent over (5)
I believe the answer is:
ditto
'the same' is the definition.
(ditto means the same as previously mentioned)
'ludicrous papers sent over' is the wordplay.
'ludicrous' becomes 'ott' (I can't explain this - if you can you should give a lot more credence to this answer).
'papers' becomes 'ID' (identification papers).
'sent over' shows that the letters should be reversed in order.
'ott'+'id'='ottid'
'ottid' written backwards gives 'DITTO'.
Can you help me to learn more?
(Other definitions for ditto that I've seen before include "Notation meaning the same again" , "Two dots indicating the same again" , "Do alternative" , "Repeat the word(s) above" , "Same again, indicated by two dots" .)