Clock

A clock was an instrument for measuring time, sometimes utilising a clockwork mechanism. Clocks worn on the wrist were called watches.

The First Doctor kept an ormolu clock in the TARDIS control room. (TV: An Unearthly Child)

The Clockwork Droids used to break clocks to hide their own ticking. (TV: The Girl in the Fireplace)

A spaceship crashed into a London clock tower known as Big Ben. (TV: Aliens of London)

Jack Harkness parked his space craft by Big Ben. (TV: The Empty Child)

Bilis Manger ran a store called A Stitch in Time where he sold clocks. (TV: End of Days)

The Institute for Technological Advancement and Research had a beryllium atomic clock for the countdown to the new millennium. (TV: Doctor Who)

The appearance of a grandfather clock was assumed on at least three occasions by the Master's TARDIS. (TV: The Deadly Assassin, The Keeper of Traken, PROSE: The Eight Doctors)

General Mariah Learman attempted to build a time machine using clocks and mirrors. (AUDIO: The Time of the Daleks)

The Eleventh Doctor wrote a "slightly intelligent" computer virus which caused all clocks to display the number zero in order to alert the Atraxi to Prisoner Zero's whereabouts. (TV: The Eleventh Hour)

The Monks used the Earth's clocks to display a doomsday clock to when the world's end would come to be at Agrofuel Research Operations, due to a series of mistakes. When the Twelfth Doctor set an explosive in the lab, the doomsday clock started reverting back as the world's end wouldn't come to be any longer. (TV: The Pyramid at the End of the World)

Sundials
The Doctor's second incarnation had a in his TARDIS. (TV: The Tomb of the Cybermen, The Mind Robber, The War Games)