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Help with 5 down please. I can't see this one at all!! Cheers

What's the clue please?

https://www.theguardian.com/crosswords/everyman/3759#5-down

Expert under oath worried about Arctic region raised difficult problem
1,4,3,2,5
a hard nut to crack

crack is the expert.... tundra is the arctic region ... ...think the rest was an anagram ...

Thanks so much! I'm being a bit thick today!!!!