What does the cryptic crossword clue "Solver finally cracks nastier sort of riddle (8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Solver finally cracks nastier sort of riddle (8)

Guardian Cryptic #29262 | 21 Across | 2023-12-26

Generating...

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

[solve]R in NASTIER*

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