Green’s Dictionary of Slang

1. a watch.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1809		G. Andrewes Dict. Sl. and Cant.
1812–82		B.M. Carew Life and Adventures.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.
c.1850		Duncombe New and Improved Flash Dict.
1906		Minneapolis Jrnl (MN) 24 Jan. 19/3: Our balsam and clickman toads don’t come from the doctors or ministers.

2. a West Countryman.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Clickman toad [...] An appellation for a West-country man, who had never seen a watch, found one on a heath near Pool, which, by the motion of the hand, and the noise of the wheels, he concluded to be a living creature of the toad kind, and, from its clicking, he named it a clickman toad.
1812–82		B.M. Carew Life and Adventures.