Newspaper Stanley's partner hasn't opened (5)

I believe the answer is:

organ

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'newspaper' is the definition.
(organ can refer to a newspaper or journal)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for organ that I've seen before include "Soft part of the body which has a specific function" , "Wind instrument found in the body." , "Possibly the heart" , "Church keyboard instrument" , "Medium; body part" .)

I've seen this clue in The Independent.

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