Related Clues:

• 'Powerfully persuasive, argument say (6)'
• Quite possible
• 'Clear and logical, argument say (6)'
• The argument might be so strong that he's a company man
• True, it's in this that one gets laid up
• It will be possible to get some credit like this
• The convincing fellow for the firm
• He's a good company man to produce such a convincing argument
• It will hold water in there in a bath chair, perhaps
• Not unsound
• The argument is convincing that he is a company man
• As a company man he is convincing
• A convincing gentleman from the company
• You can believe there's a bid in the creel
• Like a good witness