Metal crockery gets expensive coating (6,5)

I believe the answer is:

silver plate

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

'expensive coating' is the definition.
'silver plate' can be an answer for 'coating' (silver plate is a kind of coating). I'm not certain of the 'expensive' bit.

'metal crockery' is the wordplay.
'metal' becomes 'silver' (silver is a metallic element).
'crockery' becomes 'plate' (plate is a kind of crockery).
'silver'+'plate'='SILVER-PLATE'

'gets' is the link.

Can you help me to learn more?

(Another definition for silver plate that I've seen is " Valuable metallic ware".)

I've seen this clue in The Mirror.

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