1. combine or mix.   Hint First letter clue   2. calculate or reckon.   First letter clue   3. combine or unite.   First letter clue   4. increase toughness by gradual heat reduction.   First letter clue   5. hinder or retard.   First letter clue   6. cut with sharp-edged tool; cheat or treat unfairly.   First letter clue   7. force or thrust out.   First letter clue