Challenge your ski skills with this black diamond crossword clue!

The crossword question is asking for a term that describes a specific type of skiing experience. A “black diamond run” is a term used to refer to the most difficult ski slope or trail on a mountain. It is designated by a black diamond symbol on the trail map indicating that only experienced skiers should attempt it. So, the answer to the crossword question is “SKI” because going on a black diamond run requires skiing skills at an advanced level.