Crossword Genius

Try harder (4,2)

Ross

I believe the answer is:

buck up

(Other definitions for buck up that I've seen before include "Informally become more cheerful or make haste - like restless horse?" , "Take heart" , "Hurry or become more cheerful - like wild horse?" , "Become more cheerful like unruly horse" , "Become more serious" .)

I've seen this clue in The Sun.
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