Related Clues:

• Vigorous number to sing about king
• Distinctly defined openings to the right entrance
• Ditch worker being forthright
• Ditch insect is biting
• Cutting right into fish, six-footer
• Cutting a deep furrow, an industrious worker
• Hard cutting into vessel in river, though effective
• Distinct charm displayed by leaders of the Right
• Cutting channel more than half way through river
• 'Excavation' - a set of books vigorous in style
• Incisive talker's tips are fascinating
• Cutting fish without right article takes time
• Incisive in style
• Keen worker at bottom of ditch
• Vigorous tenor carelessly ignoring penultimate song