Crossword Genius

A source of tea cups and saucers? (5)

Ross

I believe the answer is:

china

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

'cups and saucers?' is the definition.
(I've seen this in another clue)

'a source of tea' is the wordplay.
I cannot quite see how this works, but
'a' is within the answer.
The remaining letters 'chin' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for china that I've seen before include "Land" , "Make a chain in the country" , "Mate (slang); crockery" , "Cathay was its archaic name" , "foreign country" .)

I've seen this clue in The Times.
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