Crossword puzzle clue "crossword clues and answers often"

Crossword clues and answers, often

Like a crossword clue about crossword clues, say

Cookies often used as crossword clues

What crossword clues with question marks often are

Like the answers to the 10 asterisked clues, more often than any other English words, according to a 1999 study

Feeling you get when all your friends are out having fun but you have to stay in and write clues for a crossword puzzle :'(

Comics character who is 65 years old this month (and whose friends are answers to asterisked clues)

Homophone of the only letters absent from the answers, and also the clues