Possible Clues:

• Howard in "Mayberry R.F.D."
• Sci-fi writer L. — de Camp
• ____ Cleghorn (with 46 Down, won 1924 Stanley Cup)
• Frank J. --, US naval officer and inventor (1857-1934)
• '90s Blue Jays third baseman Ed
• Howard ___, 'Mayberry R.F.D.' character