Green’s Dictionary of Slang

foolish, stupid.

c.1629		R. Brome City Wit V i: Why Goodman Fool, you Coxcomb, you Ninnihammer, you Clotpold Countrey Gentleman.
1847		Morn. Advertiser (London) 19 Nov. 3/7: Some clodpole speechifying squire.
1852		G.C. Mundy Our Antipodes I 218: The clouted soles of the clodpole whiteman.
1896		R.L. Stevenson Weir of Hermiston 102: Harum-scarum, clodpole young lairds of the neighbourhood paid him [...] a visit.