Possible Clues:

• End of a saying from 43-Down
• Answer to the folk riddle 'Worker in yellow clothes'
• Busy as ___ (2 words)
• ". . . sting like ___"
• End of an Ali quote
• Have --- in one's bonnet
• Last words of a boast from 43-Down
• ''... butterfly, sting like ___''
• "... butterfly, sting like ___"
• ''Float like a butterfly, sting like ___''