Crossword Genius

Saints often my sides in Rules (7)

Ross

I believe the answer is:

martyrs

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'saints' is the definition.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for martyrs that I've seen before include "Persons suffering for their beliefs" , "Those dying for their belief" , "They suffer for a principle" , "people who suffer" , "People who die for their cause" .)

I've seen this clue in the Sydney Morning Herald.
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