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Something you'll want to polish off, on your plate (7)

Ross

I believe the answer is:

tarnish

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'plate' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for tarnish that I've seen before include "Discolouration of metal surface" , "Discolour - sully" , "Taint" , "Stain or blemish, silver or reputation" , "Mountain lake" .)

I've seen this clue in the Evening Standard.
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