Possible Clues:

• Supporter of Mr Muggeridge was officially recognised
• In writing, say
• Requiring a tux
• Aloof or malcontent, keeping aloof
• Conforming to accepted customs
• Dressy ball
• In class, a learner is conventionally correct
• Established in Magaluf or Malaga
• Sounds a little hoarse about Mister up there, but not casually so
• To benefit Mother, there's nothing casual to a half-century