Possible Clues:

• On hand at university to take pressure and that's okay
• Green light for doctor entering in this way at Oxford, say
• So cheerful about doctor's encouraging signal
• Sign of approval from doctor to drink after twenty-four hours, in brief
• Hand gesture of approval
• Good sign from Ebert
• Unfamiliarity
• Unpleasant smell in empty tub associated with swill, okay?
• Seems that 4 across is out of bed, more power to him!