Related Clues:

• Helpful fellow, diving into river
• Advantageous; very able
• United's jet is fit for service
• American president takes line that's practical
• A Blues compilation is up and running
• American fuel needing reprocessing to be profitable
• Helpful to have
• American bishop stops porter working
• A blues composition, fit for purpose
• Serviceable bulb discovered after blown fuse
• Round safety device that's practicable
• Convenient reason that plug is dangerous?
• High-class fur fit for purpose
• American fuel reprocessing is practical
• Helpful stuff in magazine about cold officer becoming old-fashioned