Crossword Genius

Favourites backing part of procedure (4)

Ross

I believe the answer is:

pets

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'favourites' is the definition.
('pet' can be a synonym of 'favourite')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pets that I've seen before include "Animals at home" , "Little darlings - step on them" , "Domesticated animals" , "Domestic animals" .)

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