Related Clues:
- Lowest part; ignoble
- Underlying support (for an idea)
- Found to be unprincipled
- Bottom's centre of operations?
- Low; foundation
- Male voice, one joining in support
- Principle single voice carries
- Bottom support
- Ground's black under the current conditions
- Venial; headquarters
- Fundamental part in book unaltered
- Reason graduate succeeded with tips from instructors
- Ignoble; bottom
- Singer needs one in support
- Book, in current state, providing foundation