Related Clues:

• Increasing
• Up-and-coming
• This would never be so low
• Going up
• Going up, yes, but one's wrong about their spiralling
• Increasing? There is no change
• Theirs got tangled in one, climbing
• Either son could be going up
• Gaining in popularity
• Increasing, and a hint to 17- and 40-Across and 11- and 27-Down