Previous issues of Eagle go: obtain mag in jumble (9,7)

I believe the answer is:

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'previous issues of eagle go obtain mag in jumble' is the definition.
I can't judge whether this defines the answer.

'obtain mag in jumble' is the wordplay.
'obtain' becomes 'copyright' (copyrighting is a kind of obtaining).
'mag in jumble' becomes 'library' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'copyright'+'library'='COPYRIGHT LIBRARY'

Can you help me to learn more?

(Another definition for copyright library that I've seen is " Where new books must be deposited".)

I've seen this clue in The Guardian.

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