They trim cuts and erase fluff (9)

I believe the answer is:

secateurs

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'they' is the definition.
Both the definition and answer are plural nouns.
Maybe they are linked in a way I don't understand?

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

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(Other definitions for secateurs that I've seen before include "Gardener's tool" , "Clippers used for pruning plants" , "They make cuts" , "Small pruning shears" , "Pruning tool" .)

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

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