Possible Clues:

• Handy arrangement of flues beyond the bend
• Make yourself . . . . . . - help out
• Advantageous to America to order fuel
• Handy to have some fuel with us
• Being handy, buys self-build in regular instalments
• Serviceable, functional
• Practical and functional
• Earning one's keep, say
• Of practical use
• Functional and worthwhile