Possible Clues:

• Insistent man is superior to insect
• Impervious to appeals
• Pop star refusing to dance to someone else's tune?
• Stubborn
• Very hard computer programming language? Prayer is of no use!
• Worker supporting first man to get tough
• Girl meets chap, starts talking, but is unyielding
• A female horse soldier can be unyielding
• These days a French lover is very hard
• First person overseeing worker is determined