Related Clues:

• Endeavour, elbow grease
• Earnest attempt
• A serious attempt
• 'Endeavour, exertion (6)'
• Determined attempt
• Labour
• It needs strength to make this strong at last
• Strength is needed to make it strong at last
• You have to be strong to make it strong at last
• It needs strength to make it strong at last
• One might try to make it, because it's in the newt
• It takes strength to make it so strong at last
• Make it to make one strong at last
• The strength you need to make the place strong at last
• It's painfully laborious when the vet goes by rail like this