Related Clues:

• Beaver Cleaver expletive ... or what you might need to be to answer 18-, 23-, 51- and 60-Across?
• ''Do tell!''
• 'Boy!'
• 'Well, whaddaya know!'
• 'I'll be a monkey's uncle!'
• Right, to Black Beauty
• "Hmm . . ." to Theodore Cleaver
• Word before "whiz" or "willikers"
• "___ willikers!"
• "Gosh!" (or, based on the starts of starred answers, one who is expert at solving this puzzle's theme?)
• Mild expression of surprise, may go before whiz
• Get this up to make it gallop
• Up after this to get half a horse going
• This ought to get the horse up and going
• This gets up to the horse to make it 34 across