Possible Clues:

• In effect, leads from Tristan and Isolde very emotional after a Wagner piece?
• Workman excited over pieta
• PI or spy
• Agent
• Carmen, for instance, and Evita for the most part reviewed in Private Eye
• Worker sees nothing for each musical rejected
• Significant worker, one having special skills
• I tape over wound in action
• I have to support Aida, say -- tense worker
• Crucial time I have after event at Sadler's Wells, maybe