Fear of novelty washer in replacement of a hip bone (9)
I believe the answer is:
neophobia
'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).
'a'+'hip'+'bone'='ahipbone'
'ahipbone' is an anagram of 'neophbia'.
'o' going into 'neophbia' is 'NEOPHOBIA'.
(Other definitions for neophobia that I've seen before include "Fear of the unfamiliar" , "reluctance to innovate?" , "Dread of the new" .)