Possible Clues:

• Springing back from a hard surface
• British Trade Union welcomes conservative from Government whose popularity, for instance, is going up and down
• You'd expect this from 24 across as a result of the spring?
• Jumping up and down at what children are doing partying in castle
• (Of a baby) vigorous and healthy
• Big and healthy (baby)
• Energetic - hearty...