It's heaven to get some old rags and take them up (6)

I believe the answer is:

asgard

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'it's heaven' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for asgard that I've seen before include "Heavenly dwelling of the Norse gods" , "heavenly dwelling-place" , "Home of the Norse gods" , "Abode of Norse gods" , "mythological region" .)

I've seen this clue in The Irish Times.

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