Clock

A clock was an instrument for measuring time, sometimes utilising a clockwork mechanism.

Clocks

 * The Clockwork Droids used to break clocks to disguise their own ticking. (DW: The Girl in the Fireplace)
 * A spaceship crashed into "Big Ben", the clock tower of the Palace of Westminster. (DW: Aliens of London)
 * Jack Harkness parked his space craft by the clock tower of the Palace of Westminster. (DW: The Empty Child)
 * Bilis Manger ran a store called A Stitch in Time, where he sold clocks. (TW: End of Days)
 * The Institute for Technological Advancement and Research had a beryllium atomic clock for the countdown of the new millennium. (DW: Doctor Who (1996))

Watches

 * Sarah Jane Smith received a scanner watch by the Doctor. (SJA: The Sarah Jane Adventures)

Fob watches

 * A crucial part of the Chameleon Arch looked like a fob watch. (DW: Human Nature, The Family of Blood, Utopia) Upon meeting Jackson Lake and seeing his fob watch, the Doctor thought that Jackson might be an incarnation of himself. (DW: The Next Doctor)