Fatuous one follows papers to do with hearing (7)
I believe the answer is:
idiotic
'fatuous' is the definition.
(thesaurus)
'one follows papers to do with hearing' is the wordplay.
'one' becomes 'i' (Roman numeral).
'follows' means one lot of letters go next to another.
'papers' becomes 'id' (identification papers).
'to do with hearing' becomes 'otic'.
'i' put after 'id' is 'idi'.
'idi'+'otic'='IDIOTIC'
(Other definitions for idiotic that I've seen before include "Fatuous" , "Daft" , "Absurd, crackbrained" , "without any point" , "Senseless" .)