Crossword Puzzle Advanced photocopier features

Clue: Advanced photocopier features

Window features (PANES with 5 letters)
Airplane seat features (e.g. ARMRESTS with 8 letters)
Mystery features (TWISTS with 6 letters)
Two features of being tormented with endless replayings of "Dear God"? (AGONYANDTHEXTC with 14 letters)
Football-shoe features (CLEATS with 6 letters)
Cathedral vault features (GROINS with 6 letters)
Teacher's advanced deg. (e.g. EDD with 3 letters)
Certificate features (SEALS with 5 letters)
Features in many Fra Angelico paintings (HALOES with 6 letters)
Corset features (STAYS with 5 letters)