Information in special air letter about uranium (10)
I believe the answer is:
literature
'information' is the definition.
(thesaurus)
'special air letter about uranium' is the wordplay.
'special' indicates anagramming the letters.
'about' is an insertion indicator.
'uranium' becomes 'U' (U is the chemical symbol for uranium).
'air'+'letter'='airletter'
'airletter' anagrammed gives 'literatre'.
'literatre' enclosing 'u' is 'LITERATURE'.
'in' acts as a link.
(Other definitions for literature that I've seen before include "writer's work" , "Work by Spenser for instance" , "fliers" , "Written works of artistic merit" , "Reading matter" .)