Possible Clues:

• Likely, bet-wise
• Puzzling child, as favourite may be
• Eccentric descendant most likely to succeed?
• With success more likely as bookie would calculate
• A better than even chance of success
• Strange child most likely to come up
• ... exceptional child is very likely to succeed
• Very likely that that favourite boy of yours is eccentric
• Implausible item in musical getting cut? Very likely
• Strange, young Dombey fixing betting price?