Possible Clues:

• Al Hirt or Dizzy Gillespie, notably
• You'll get the boy at last on the blower
• Bird who sends out signals?
• Elephant perhaps a valuable advantage, with tree to be uprooted
• After tea that's an odd sort of fellow to get on the blower
• The first drink boy takes as a bandsman
• Instrumentalist rendering odd favourite with hesitation at end of concert
• Spirits after tea will make boy blow up
• Musician offering last item in concert, strange man
• You get blows from one such odd fellow after tea