What might make study dusty? (7)
I believe the answer is:
anagram
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for anagram that I've seen before include ""Supersonic"of "percussion", for example?" , "Jumbling of letters" , "Rearrangement of letters in word or phrase to form another" , "Word that rearranges another's letters" , "Word formed by changing the order of letters in another" .)