Fedora part (4)
I believe the answer is:
brim
'fedora part' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for brim that I've seen before include "Peak (of cap); be very full" , "Lip; part of a hat" , "Top edge of something" , "Top edge of a container" , "Edge (of cup or hat)" .)