Crossword Puzzle Indy cars lack these

Clue: Indy cars lack these

Indy car's lack (REARSEAT with 8 letters)
What many sports cars lack, and, in a way, what the ends of the starred answers are (REARSEATS with 9 letters)
Lacking in detail (BROADBRUSH with 10 letters)
Indy 500 name (UNSER with 5 letters)
Lack direction (ROAM with 4 letters)
Airhead's lack (CLUE with 4 letters)
Lacking depth, in brief (TWOD with 4 letters)
Birthplace of John Wayne and Johnny Carson (IOWA with 4 letters)
Lack of sincerity (GLIBNESS with 8 letters)
Utopias lack them (EVILS with 5 letters)