Material in publication unknown in east (9)

I believe the answer is:

organzine

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'material' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'publication unknown in east' is the wordplay.
'publication' becomes 'organ' (organ is a kind of publication).
'unknown' becomes 'z' (algebra).
'east' becomes 'e' (abbreviation).
'organ'+'z'+'in'+'e'='ORGANZINE'

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.

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