A hat you may have read of (6)
I believe the answer is:
fedora
'a hat' is the definition.
(I know that fedora is a type of hat)
'may have read of' is the wordplay.
'read of' anagrams to 'FEDORA'.
Though, I'm not sure how the anagram is indicated.
'you' acts as a link.
Can you help me to learn more?
(Other definitions for fedora that I've seen before include "Read of (anag) - brimmed felt hat" , "Soft hat with band" , "Brimmed hat with creased crown" , "O, Fred, a hat becomes you" , "Style of hat" .)