Related Clues:

• The letter from Greece was for a swallow
• To be one over this, by the sound of it, was not caused by what one drank
• What one did with one's tea, but not the tea itself
• There's nothing like it for the unaspirated or the swallow
• Took the sound of the number as a matter of course
• 'One over this is not tight, as a matter of course (3)'
• The sound of the number one swallowed
• '1/7, perhaps, the put an end to 8 down (3)'
• What the swallow did and would be no more after half a century
• What one did to make one so fed up
• Had some cake
• Got things down
• Enjoyed hors d'oeuvres, say
• Didn't go fast?
• Took in one over seven, by the sound of it