Possible Clues:

• One into sophistry about slack suits?
• Shy around this person, gripped by American quibbler
• Student of morality
• Eye problem holds us back against one fine debater
• One who finds excuses for everyone is among the players
• Resolver of moral dilemmas
• One quibbles about heading for some Scottish islands
• Theological hair-splitter
• He uses clever but false reasoning on moral issues
• The accountant's suit is twisted as a general rule with him