Related Clues:
- Fuel source from bogs
- Three-__: sports portmanteau
- Painting's deeply boring
- Instruction to mechanic might be a bore
- Eliminate all friction from fuel source
- Base of rig — lubricate generously
- Fastener securing new boat and (contraindicated) fertiliser source
- Shaft to extract fuel
- Natural solid fuel
- Boring - source of petroleum
- Fuel cut from bog
- Source of fuel
- Whence petroleum is extracted
- Source of 'black gold'
- Borehole for petroleum