Now we are getting really tricky. This is like a maze: start at the arrow, in this case pointing at the letter c and move across or down (but not diagonally) like a snake, to make a word. The first word has been done for you: clear. The next word follows on immediately from the first, the third from the second and so on. Every letter is used once, with the final word ending where the arrow exits (in this case the letter s).
This is even harder because you don’t know what the words are or which letter they begin with, but you do know how long they are.
One for the real puzzle champs and definitely in the very hard, Brainbender category!