Solutions Brief intense efforts has 8 entries with similar clues

• 3-letter words
• tlcSome restoration efforts
• 4-letter words
• cogs...... in the machine (unappreciated contributors to large efforts)
• 5-letter words
• painsEfforts
• letupReduction in intensity or relaxation of efforts
• 8-letter words
• redoubleIntensify energetically one's efforts
• 9-letter words
• self-madeHaving achieved success, wealth, etc., by own efforts
• 10-letter words
• in-earnestSeriously and with full efforts
• 12-letter words
• sink-or-swimFail or succeed by one's own efforts