Crossword Genius

Relative raises cats and dogs in the nunnery (10)

Ross

I believe the answer is:

stepsister

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'relative' is the definition.
(stepsister is a kind of relative)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stepsister that I've seen before include "relative in law" , "member of the family" , "Relation gained through a second marriage" , "one who hated Cinderella" .)

I've seen this clue in The Irish Times.
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