Crossword puzzle clue "related to proselytising"

a person undertaking a mission and esp. a religious mission

(German) vowel change in related words, esp. that in Indo-European, which survives in English in e.g. sing, sang, sung, song

a skin disease caused by inflammation of the sebaceous follicles, esp. on the face, neck, and shoulders

a sense of hearing

(relating to) aircraft or aeronautics