Possible Clues:

• Serious bridge players follow opening bid?
• Concentrated on how numbers are recorded on earth
• Ardent
• May nine get set and concentrated in verbal form?
• Sent in wrong key, being dense
• It's concentrated in the past, present and future
• Forceful, concentrated
• Extreme living at 29, in a manner of speaking
• Very concentrated or passionate
• Concentrated, serious