Spooner’s ironic duty, making closet fixtures (3,5)

I believe the answer is:

tie racks

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'fixtures' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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