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Anthem and poem are thus improved (7)

Ross

I believe the answer is:

emended

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'improved' is the definition.
(emending is a kind of improving)

I can't explain the rest of the clue.

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(Other definitions for emended that I've seen before include "Rectified" , "Improved" , "subjected to correction" , "Edited" , "Made changes to" .)

I've seen this clue in The Independent.
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