Possible Clues:

• Barracker's irritated cry about Liberal turning up
• One tackling politician gets ragged cheer about a thousand pounds
• One interrupting Speaker — drat! — Liberal, before short hesitation
• He breaks into a politician's address
• Performer's bane
• Person interrupting public speaker
• Disturbingly, he calls suddenly at your address
• Gives joker a hard time with surprise left in hospital
• Ambassador and clerk pounded knocker
• One could upset speaker -- he upset clerk