Crossword Genius

Different cardinals once acting gently (4)

Ross

I believe the answer is:

mild

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'different' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for mild that I've seen before include "Moderate, temperate" , "Not severe or harsh" , "Gentle and moderate" , "Calm" , "Gentle in temper and disposition" .)

I've seen this clue in The Independent.
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