Crossword Genius

At home, copper starts searching for a tiny bone (5)

Ross

I believe the answer is:

incus

I'm a little stuck... Click here to teach me more about this clue!

'tiny bone' is the definition.
'incus' can be an answer for 'bone' (I've seen this before). I'm unsure of the 'tiny' bit.

'at home copper starts searching' is the wordplay.
'at' means one lot of letters go next to another.
'home' becomes 'in' ('he's home' can mean 'he's in').
'copper' becomes 'Cu' (Cu is the chemical symbol for copper).
'starts' indicates taking the first letters.
The first letter of 'searching' is 's'.
'in'+'cu' is 'incu'.
'incu'+'s'='INCUS'

'for a' acts as a link.

Can you help me to learn more?

(Other definitions for incus that I've seen before include "Bone in the middle ear" , "Ear anvil bone" , "Hard part of the Listener" , "part of sound system" , "Anvil-shaped bone in ear" .)

I've seen this clue in the Sydney Morning Herald.
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