Crossword Genius

The first Derby winner ridden by Lester Piggott, in 1954 (5,3,3)

Ross

I believe the answer is:

never say die

(Other definitions for never say die that I've seen before include "Don't stop" , "Be resolute" , "don't give up hope" , "Persevere!" , "Refuse to give up" .)

I've seen this clue in The Independent.
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