They may nip out in pairs (8)

I believe the answer is:

tweezers

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for tweezers that I've seen before include "Pair of tongs" , "Splinter removers" , "Hair pluckers" , "Eyebrow plucking tool" , "Device for plucking hairs" .)

I've seen this clue in The Irish Independent.

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