Wicket-keepers perhaps, who can be difficult to get out? (9)

I believe the answer is:

squatters

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'wicket-keepers' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps you can see a link between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for squatters that I've seen is " Illegal occupiers".)

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