Possible Clues:

• Blend
• Perform mathematical task and get in tangle with estimate
• Awful trait - gene pool mix!
• In this get-up at this speed one will get together
• In where there's fire, and it will all come together
• Unify
• Merge bits of giant tree coming apart
• Bring together
• Irate gent ordered to fit in
• Combine to get note accepted by unappreciative type