Crossword Genius

Jack who stole those tarts? (5)

Ross

I believe the answer is:

knave

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'jack' is the definition.
(knave can mean a jack playing card)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for knave that I've seen before include "Scoundrel - card" , "Rapscallion" , "Jack - scoundrel" , "Rascal; picture card" , "A swindler" .)

I've seen this clue in The Sun.
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