Sentence:  ... what kind of courage it must have taken for Hawkins, an actor renowned for the quality of his voice, to go back onto the set to deliver lines in that oesophageal monotone, what he called his "<WSD>Dalek</WSD> voice". 
Meaning of the word marked with <WSD> tags:  A member of a species of extraterrestrial cyborg mutants who appear in the television programme "Doctor Who" and are known for travelling in metallic shells, having monotone, mechanically distorted voices, repeating a limited number of phrases, and being bent on exterminating other beings mercilessly.