Writer holding broken arm hospital department fixed (9)
I believe the answer is:
permanent
'fixed' is the definition.
(I've seen this before)
'writer holding broken arm hospital department' is the wordplay.
'writer' becomes 'pen' (something which writes).
'holding' means one lot of letters goes inside another.
'broken' indicates an anagram.
'hospital department' becomes 'ENT' (abbreviation for Ear, Nose and Throat department).
'arm' is an anagram of 'rma'.
'pen' going around 'rma' is 'perman'.
'perman'+'ent'='PERMANENT'
(Other definitions for permanent that I've seen before include "that's not changing" , "Lasting; not temporary" , "not expected to change" , "Fixed" , "Lasting, enduring" .)