Crossword Puzzle Tiller opening?

Clue: Tiller opening?

Tiller opening (ROTO with 4 letters)
"Now is the winter of ___ discontent" (opening line of "Richard III") (OUR with 3 letters)
Farm opening (AGRI with 4 letters)
Openings for some companions (PETDOORS with 8 letters)
Tiller attachment (RUDDER with 6 letters)
Eye-opening drink (e.g. BRACER with 6 letters)
Reservation opening (ONSECONDTHOUGHT with 15 letters)
Dermal opening (e.g. EPI with 3 letters)
Opening course, often (SOUP with 4 letters)
Musical whose opening song is "All the Dearly Beloved" (IDOIDO with 6 letters)