Old-fashioned copper in the kitchen (6)

I believe the answer is:

peeler

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'old-fashioned copper' is the definition.
'peeler' can be an answer for 'copper' (I have seen 'Old copper' mean 'peeler' so perhaps 'copper' could also mean 'peeler'). I am unsure of the 'old-fashioned' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for peeler that I've seen before include "Kitchen gadget - old policeman" , "Potato skinner" , "Kitchen knife" , "stripper" , "Old London policeman" .)

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