Crossword Puzzle Important trial figures

Clue: Important trial figures

Important trial figure, or what you'll be when you read this puzzle's other four longest answers (MATERIALWITNESS with 15 letters)
Important trials (LITMUSTESTS with 11 letters)
Trial figures: Abbr. (ATTS with 4 letters)
Figures in 1925 trial (APES with 4 letters)
Trial figures (STENOS with 6 letters)
Important source of iron (MESABI with 6 letters)
Summer figures? (ADDENDS with 7 letters)
Avoid a trial, say (SETTLE with 6 letters)
Difficult trial (ORDEAL with 6 letters)
Trial attorney Melvin (BELLI with 5 letters)