As I've said, I'm in London, and I was attempting to do the crossword in the Evening Standard last night. Americans might not understand the traditional British crossword, which will use cryptic clues, like anagrams and constructing words somewhat like a charade, and a major part of the puzzle is figuring out how to interpret the clue.
Anyway, 18 Down leapt to my eye. "A brilliant weekend at the nudist camp?" with 5 letters.
I did get it, but not until I had a couple of the intersecting words. The answer is "stark". Brilliant = "star", weekend = the last letter of the word "week", whole word relates to nudity. Happily, they didn't say "nudist colony"!
Maybe I should have posted the clue before the answer. Sorry.