Crossword Genius

Rascal found in church we hear (5)

Ross

I believe the answer is:

knave

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'rascal' is the definition.
(I know that rascal can be written as knave)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for knave that I've seen before include "Jack - rotter" , "Yet he may be a diamond" , "Jack - rogue" , "Rat" , "Villain - jack" .)

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