Expert, and what's in motion in 1-, 20-, 40-, 57- and 71-Across 3 letters

Crossword clues for Expert, and what's in motion in 1-, 20-, 40-, 57- and 71-Across 3 letters

Answer	Clue
PRO	Expert, and what's in motion in 1-, 20-, 40-, 57- and 71-Across