Crossword Puzzle Teachers' org. since 1857

Clue: Teachers' org. since 1857

Organism bodies (SOMAS with 5 letters)
Breathing organ (e.g. GILL with 4 letters)
Bristlelike organs (SETAE with 5 letters)
World Health Organization concern (FLU with 3 letters)
Work on an organ, maybe (OPERATE with 7 letters)
Certain youth orgs. (YMCAS with 5 letters)
Organization that began broadcasting on July 4, 1950 (RADIOFREEEUROPE with 15 letters)
Teachers' degrees (PDBS with 4 letters)
Well-organized person (PLANNER with 7 letters)
Joanne of "Sincerely Yours" (DUE with 3 letters)