Related Clues:

• A plug, say, having this might not be so beneficial
• No fused section is serviceable
• Nifty wolf cub seen intermittently
• Helpful fellow, diving into river
• Helpful to have
• Round safety device that's practicable
• Having a benefit
• Helpful (2 words)
• Worth keeping around
• Coming in handy
• Practicable round safety device
• Ordinary circuit breaker may be helpful
• Helpful to have the real reason for Fawkes's failure?
• Serviceable East Anglian river circling edge of Fens
• FA join? That's handy!