Sentence:  As soon as Julia returned with a <WSD>constable</WSD>, Timothy, who was on the point of exhaustion, prepared to give over to him gratefully. The newcomer turned out to be a powerful youngster, fully trained and eager to help, and he stripped off his tunic at once. 
Meaning of the word marked with <WSD> tags:  One holding the lowest rank in most Commonwealth police forces. (See also (chief constable).)