clach, clack noun
1 a pound note 20.
2 a pound in weight: A clach o rools for the shauch. [A pound of barley for the broth.] 20.
3 a stone 19-. etymology: Scots Gaelic clach ‘a stone’; sense 3 also collected by Simson (1865); senses 2 and 3 attested by Galloway and Perthshire and Argyleshire Tinkler-Gypsies and SS; sense 3 attested by BS in TDITA