Peevish remark I made (9)
I believe the answer is:
crossword
But I can't explain it at all! Could you help me understand?
(Other definitions for crossword that I've seen before include "Cruciverbal test" , "Puzzle with squares" , "See 8, 20 ac, 1, 15 dn" , "Puzzle like this one" , "(Usually) black and white puzzle" .)