Writer who changes it and hides fury (9)
I believe the answer is:
tragedian
'writer' is the definition.
(tragedian is a kind of writer)
'changes it and hides fury' is the wordplay.
'changes' indicates an anagram.
'hides' is an insertion indicator.
'fury' becomes 'rage' ('rage' can be a synonym of 'fury').
'it'+'and'='itand'
'itand' with letters rearranged gives 'tdian'.
'tdian' placed around 'rage' is 'TRAGEDIAN'.
'who' is the link.
(Other definitions for tragedian that I've seen before include "Egad, I rant about dramatic actor" , "Serious actor" , "Dramatist" , "actor in Macbeth?" , "Egad, I rant about actor in sad drama" .)