Crossword Genius

Recipe for stubborn creature finally changed (7)

Ross

I believe the answer is:

formula

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'recipe' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for formula that I've seen before include "Group of symbols expressing a rule" , "Mathematical rule expressed in algebraic symbols" , "Recipe, procedure" , "Milk substitue for babies" , "Combination of ingredients or symbols" .)

I've seen this clue in The Sun.
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