Journalist going in for a hat (6)
I believe the answer is:
fedora
'hat' is the definition.
(I know that fedora is a type of hat)
'journalist going in for a' is the wordplay.
'journalist' becomes 'ed' (short for editor).
'going in' means one lot of letters goes inside another.
'ed' put inside 'for' is 'fedor'.
'fedor'+'a'='FEDORA'
(Other definitions for fedora that I've seen before include "Headgear" , "Read of (anag) - brimmed felt hat" , "Cover for head" , "Felt hat dented lengthways" , "Felt hat with a creased crown" .)