Related Clues:

• Eh?
• "That's enough"
• Major medical grp
• Start of many a 'Jeopardy!' response
• Word from the hard-of-hearing
• '___ knew?'
• Doctor of British sci-fi
• First baseman, to Abbott and Costello
• 'I beg your pardon?'
• "On what date?"
• Repetition request
• Question of recognition
• ''What guy?''
• Engineer, did you say? Please repeat!
• 'Tommy' group, with 'The'