Pests possibly fired (5)

I believe the answer is:

slugs

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for slugs that I've seen is " Land molluscs".)

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