Related Clues:

• Partners of aches
• French bread's giving cramps, perhaps
• 'It ___ me to say this ...'
• Beaver away
• Sweat and strain
• Perfectionists take great ones
• Labor arduously
• Labour triumph's beginning to be undermined by smear
• Great care taken with sheets of glass reportedly
• Hard work, labour
• Plug away (at)
• "It __ me to say ... "
• "Double, double __ and trouble"