Possible Clues:

• Head of state after winds up redundant
• Aggravates school head? That's not called for
• It's unnecessary not to want so much
• Lessened, as not required
• Points South - that's hardly necessary
• They point to the South, but don't have to (8)
• Irritates son - that's uncalled-for
• Don't have to have points to the South
• Aggravates school-head? That's not called for
• This has a point and ship hasn't a point