Possible Clues:

• Pupil-widening drug, e.g
• Eye surgeon's instrument
• Eye opener?
• Contracting muscle
• Expanding, I do corollary of 'Live Today' for the listeners?
• Muscle such as that controlling eye's pupil
• Muscle such as that controlling eye’s pupil
• Muscle you need to lift register and large papers
• Stretcher brought when fashion designer clutches muscle
• Muscle is slow to react when the yen isn't there