Crossword Genius

Animals run away, first to last (4)

Ross

I believe the answer is:

cats

'animals' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for cats that I've seen before include "Siamese, Persian etc" , "Show" , "Musical (felines?)" , "Spectacular Llyod Webber feline musical" , "Musical; animals" .)

I've seen this clue in The Guardian.
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