Clattery machine fillets fish before fishmonger's closing (10)

'clattery machine' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'fillets fish before fishmonger's closing' is the wordplay.
'fillets' becomes 'bones' (I can't justify this - if you can you should give a lot more credence to this answer).
'fish' becomes 'hake' (type of fish).
'before' means one lot of letters go next to another.
'closing' suggests the final letters (the letter which ends or closes the word).
The final letter of 'fishmonger' is 'r'.
'bones'+'hake'+'r'='BONESHAKER'

Can you help me to learn more?