Possible Clues:

• Such a mixture of maths is enough to take one's breath away
• A way that maths may have one out of breath
• A good man first heals mother's bronchial complaint
• A mixture of maths that could leave one breathless
• A maths problem? Its victims think it's a wheeze
• Disorder when the Queen joins the volunteers?
• Mat has aggravated breathing complaint
• With some maths, a thing that will make one breathless
• Has perhaps, over time, given mother breathing problems
• Chronic breathing complaint