Instrument shown by a publication in the States (8,5)

I believe the answer is:

american organ

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

'instrument' is the definition.
(American organ is an example)

'a publication in the states' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
'publication' could be 'organ' (organ is a kind of publication) and 'organ' is located in the answer.
This explanation may well be incorrect...

'shown by' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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