Related Clues:

• What's this left in to act as a reminder?
• A party may need one - to be released?
• Criminal I bid to reserve defence
• Evidence for being elsewhere at time of crime
• Defence of one book involved in a libel? Not half
• Speeding, perhaps in cold frost
• Breaking bail, one has a defence
• I will support a party in defence
• Court defence
• Court evidence one was elsewhere
• (Crossword) hint
• A party I attended, though claim to have been elsewhere
• Sort of explanation? A slick one's no good
• It shows one wasn't at crime scene
• Excuse for starting a long, interesting book immediately