Related Clues:

• Wield - apply
• Make a strenuous effort
• Cause (oneself) to make a strenuous effort
• Put out, as energy
• Apply pressure, maybe returning genealogist's work around ten
• Exercise, wield
• Apply, as mental energy
• Use up, as energy
• Apply muscle power
• Maintain penniless specialist
• Former partner back about Tuesday to pull out all the stops
• Put to use, vigorously
• Employ with vigor
• Apply to pack 10 in upturned box, say
• Apply force