Possible Clues:

• This here is where the angry one is
• What this is
• 'That's what this is (3,6)'
• First light?
• That's what this is
• Start of many a puzzle
• The first clue, as it is known, is perfect starting off? Answer - it's irritable!
• This is enough to make you angry at last
• That's it
• Ferryman should get first clue