Silly phrases from the right papers (6)
I believe the answer is:
stupid
'silly' is the definition.
(thesaurus)
'phrases from the right papers' is the wordplay.
'phrases' becomes 'puts' (putting is a kind of phrasing).
'from the right' says the letters should be written backwards.
'papers' becomes 'id' (identification papers).
'puts' in reverse letter order is 'stup'.
'stup'+'id'='STUPID'
(Other definitions for stupid that I've seen before include "Obtuse" , "Gormless" , "Ass" , "Ignorant" , "Without much intelligence" .)