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

I believe the answer is:

squatters

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the rest of the clue.

Can you help me to learn more?

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

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.