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Meaning of clocker

clock•er

Pronunciation: (klok'ur), [key]
— n.
  1. a person who times racehorses during tryouts to determine their speed.
  2. an official who times a race.
  3. a person who maintains a record of the flow of traffic, as of visitors to a museum.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.