Initially muddle everything - use wrong bone (7)

I believe the answer is:

malleus

'bone' is the definition.
(I know that malleus is a bone)

'initially muddle everything use wrong' is the wordplay.
'initially' suggests taking the first letters.
'everything' becomes 'all' (all things).
'wrong' indicates an anagram.
The initial letter of 'muddle' is 'm'.
'use' with letters rearranged gives 'eus'.
'm'+'all'+'eus'='MALLEUS'

(Another definition for malleus that I've seen is " hammer".)

I've seen this clue in The Daily Express.

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