A clock in a dream often makes time pressure visible -- a deadline, an aging process, or an urgency you've been feeling but haven't put into words. A clock running backward or stuck can reflect a wish to slow down or reclaim a moment you feel is slipping past you.
The lord of the second house hath the same strength in hurting, as the lord of the eighth; the lord of the sixth, the same with the lord of the twelfth. - William Lilly (1602.-1681.)