Possible Clues:

• They're hidden annually
• Rewards after a fast time for all those in 23 down losing the head here on small horses
• Grease gets smeared around seasonal gifts
• Naughty teaser urges seasonal treats
• Chocolate not brought to the hatch?
• Possibly segregates articles that may be present in April
• They're laid after being lent
• Segregates fancy pieces of chocolate
• Hidden treasures
• Targets of a springtime hunt