Possible Clues:

• Stress beginning to lessen during illness
• Grammatical change to a word, often via a prefix or suffix
• Change in mood perhaps in 50 consumed by disease
• Labour's leader overcome by disease and stress
• Pitch is left in clinical condition
• Stress produced by disease engulfing hospital, finally
• Left with something to fight about, vocal change
• Stress of Labour leader in disorder...
• Stress of left in disorder
• Disease found around port causing stress