Possible Clues:

• Line retained by actor not adapted for singer
• Love to replace East in a key part of singer
• Singer, bad lot, supporting one-time Nicaraguan guerrilla?
• Singer needing endless discipline to retain key
• Total corn! (anag)
• Total corn production is heard in Copland's The Tender Land
• Study limitations of tenor singer -- or another?
• Conservationists plugging reef material as far as deep, for women
• Female voice of the lower register.