Magnetic holders? (7)

I believe the answer is:

keepers

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

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

This is all the clue.

Can you help me to learn more?

(Other definitions for keepers that I've seen before include "Goalies" , "Custodians, stewards" , "Zoo attendants" , "Players in goal" .)

I've seen this clue in The Globe and Mail.

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.