Crossword Genius

Knight tucking into salmon platter (4)

Ross

I believe the answer is:

lanx

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

'platter' is the definition.
(I know that lanx is a type of platter)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for lanx that I've seen is " Old platter".)

I've seen this clue in The Times and The Sunday Times.
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