Related Clues:

• Persuasive
• Firm takes on man, well-spoken and persuasive
• Company man's influential
• Powerful info during company time
• Businessman was convincing
• Powerful chap taken on by firm
• Convincing information for son in price
• Very convincing businessman?
• Persuasive man in business?
• Clearly argued
• Compelling information carried by trigonometric function
• Clear, logical and convincing
• Convincing firm to take on one of the chaps formally
• Convincing (argument)
• Logical bloke backing firm