Fear of novelty washer in replacement of a hip bone (9)
I believe the answer is:
Here is my best explanation:
'fear of novelty' is the definition.
(fear of the new)
'washer in replacement of a hip bone' is the wordplay.
'washer' becomes 'o' (O resembles a metal ring or washer).
'in' is an insertion indicator.
'replacement of' is an anagram indicator (I've seen 'replacement' mean this).
'ahipbone' is an anagram of 'neophbia'.
'o' going into 'neophbia' is 'NEOPHOBIA'.