Possible Clues:

• Conductor Sir Thomas
• Thomas and a maiden sitting under tree
• Old maestro taking cap off hole in device filming workers?
• Conductor Wood - ace associated with Prom ultimately?
• British conductor Sir Thomas
• London Philharmonic founder Sir Thomas ___
• Conductor, oddly, became hot
• Sit Thomas —, C20 English conductor
• Wood, a leader of men, as conductor
• English conductor Thomas