Sentence:  Single-handed [sic] he swung the staid Western Union from its ordinary singing-telegram policy to the point where local patrons can request that their greeting be sung in <WSD>Donald Duck</WSD> voice. 
Meaning of the word marked with <WSD> tags:  One of the Disney cartoon characters, an anthropomorphic white-feathered duck who usually wears a sailor suit and is known for his voice especially in tantrums.