Possible Clues:

• Feverish strain, jammed in shopping centre
• Thoroughfare across a sort of valley that's associated with disease
• Feverish that there's only room for one singing voice in the shopping centre
• Like fever produced by something sung in precinct
• Air in shopping centre associated with illness
• Feverish, in a way
• Like some fevers
• Spreading alarm - I, with a student will get fever of this type!
• The song in the Mall is a feverish one
• 24 across is musical in a thousand and all