Crossword puzzle clue "halftone feature"

Halftone feature

Frederic who invented halftone photoengraving

Ratlike feature, and a hint to a feature of the four starred answers

Creature feature feature

Pie feature, or feature of this puzzle's other four longest answers

Primary feature of a TripTik

Event where the number 12 is important, and a feature of 12 two-word answers in this puzzle

Car safety feature, for short