Funny Business 
Underworld boss? DEVIL
Beethoven’s love MUSIC
Strong-ox connector ASAN [no yoke]
Letters from your parents? DNA
Mill output? RUMOR
Drive to drink? THIRST [doesn’t need question mark]
Some swing seats TIRES
Theme clues:
Matchmaker’s workplace? CHEMISTRYLAB
Racetrack owner’s workplace? OVALOFFICE
Plus:
Two Beethoven’s; two Monopoly’s; two slapstick’s; two Bard’s
Even at my age I barely remember ESTES Kefauver. [Estes Park is a beautiful place]
ALER [admittedly a pet peeve]
