Crossword Genius

Resilient character; baffling enigma (1,4,3,2,5)

Ross

I believe the answer is:

a hard nut to crack

(Other definitions for a hard nut to crack that I've seen before include "a difficult problem" , "It takes a lot of sorting out" , "formidable opponent" , "Brazil creating problem" , "formidable opposition" .)

I've seen this clue in the Sydney Morning Herald.
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