Crossword Puzzle Capable of turning

Clue: Capable of turning

"Love is the only force capable of turning an enemy into a friend" speaker, familiarly (MLK with 3 letters)
Incendiary offense (ARSON with 5 letters)
Place in office (ELECT with 5 letters)
Post office flier (USFLAG with 6 letters)
Official seal: Fr. (SCELLE with 6 letters)
Certain ad offerings (RENTALS with 7 letters)
Office worker's calendar (APPOINTMENTBOOK with 15 letters)
Officers' sch. (OTS with 3 letters)
Offshore eyesore, to some (OILRIG with 6 letters)
Student-beautician's offering? (LEARNERSPERM with 12 letters)