Possible Clues:

• One given to eat sandwiches then rolls (mutton)
• Lacking in hearing
• For this, speak up
• One got nothing from 17 across, by the sound of it
• See 22-Down
• Like many who sign
• Like many Gallaudet College students
• Oblivious to four notes?
• Impervious to argument about half of deaths, full stop!
• ___ West Theatre (organization whose productions combine ASL and spoken English)