Related Clues:

• Drink up, friend - that's only one round
• Of course that's the alternative piece of it
• The alternative to one bit, of course
• All the way round, or not all of it
• The alternative portion, of course
• How one gets all round, or only a part of it
• A round of beastly drink
• One round to drink
• Is one's friend up to such a beastly drink?
• It's all round or just a piece of it
• Got around it or got your teeth into it
• Last round, of course, if your friend is up to it
• The first of 21 across might be the last of 16 down
• Going around the course or part of it
• One round of drink (3)