Possible Clues:

• Diplomatic staff member
• Stick 22 across on it to make a case of it
• Case for a lawyer?
• This might give pain to a teetotaller in this case
• That's a case or the teetotaller being just a pain
• Stick to point as a junior diplomat
• Member of ambassador's staff
• A 23 across case for a diplomat non drinker
• Diplomatic officer
• Case in court