Worst or best way to help a duvet maker (5,4)

I believe the answer is:

bring down

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'worst' is the definition.
Although both the answer and definition are verbs in their base form, I don't see how one could define the other.

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

Can you help me to learn more?

(Other definitions for bring down that I've seen before include "Overthrow; humble" , "make trip" , "floor" , "shoot" .)

I've seen this clue in The Globe and Mail.

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