Related Clues:

• Tennis serve that the receiver can't reach
• Tennis serve that the opponent can't reach
• Best type of tennis serve
• Playing card with a single symbol
• Single unit on playing cards
• One in playing-cards
• Oh, O'Lene, by tradition of course that means drinks all round!
• It's quite an achievement, of course, to have only a single tyre punctured
• That one is the winner
• That's the one that ought to win
• The winner that comes first in 16 down
• How one gets to the end of the place
• One tone of a solvent
• Just one of the pack
• One sort of tic that can make one acid