There is only one entry for Clyne at Menmuir in Alison Mitchell's "Angus Monumental Inscriptions" - it is for a James Clyne, schoolmaster there from 1787, who died in 1817. On the west side of the stone, a William Clyne who died at Tigerton, is mentioned, with his wife, Isabella Keith (both are of more recent date).
The full text of James's side of the stone is quoted in Jervise's "Epitaphs", praising his care for his pupils, and saying he was a native of Strichen in Aberdeenshire and educated at Marischal College in Aberdeen.