Crossword Genius

They're used to hoist court cards (5)

Ross

I believe the answer is:

jacks

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

'court cards' is the definition.
(jack is a kind of court card)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for jacks that I've seen before include "salts" , "Small bowls" .)

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app