Possible Clues:

• Horseman or cyclist
• In addition to the Rhode Island Red's comeback
• H. - Haggard, English novelist (She, etc)
• Legislative addition
• 25 Down passenger
• Example of cavalier afterthought, oceanbound in play
• Yet it might be quite a pedestrian clause
• Equestrian or biker?
• One of those in White's hot car I crashed?
• Possibly cavalier recommendation made in court