Crossword puzzle clue "question raised by four squares in this puzzle"

Question raised by four squares in this puzzle?

Question asked by a customs officer or a kid on Christmas ... with a hint to this puzzle's circled squares

Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers

Popular browser extension ... or a literal description of four black squares in this puzzle

Feature of this puzzle that's "fixed" by a literal reading of four squares

Time of annual madness ... or a hint to four squares in this puzzle

Winter driving hazard ... or a literal hint to four squares in this puzzle

Word aptly represented by four black squares in this puzzle