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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Headscratcher:

HEADSCRATCHER: Puzzling situation
HEADSCRATCHING: Hard to explain
POSER: Headscratcher
WHYWOULDONEFIND: Nitpicker's headscratcher (Part 1)
LICE: Headscratching problem?
FAULTTHERES: Nitpicker's headscratcher (Part 2)
NOREWARDOFFERED: Nitpicker's headscratcher (Part 3)
LICE: They're a headscratcher