Green’s Dictionary of Slang

clover n.

In compounds

clover-eater (n.)

(US) an inhabitant of Virginia [the impoverished jnhabitants].

[US] ‘South-Western Sl.’ in Overland Monthly (CA) Aug. 129: For no particular reason that I am aware of, a Virginian is styled a ‘Clover eater’.
clover-kicker (n.)

1. a clumsy oaf, a boor, a dull-witted peasant.

[US]Wadsworth Gas Attack 15: Clover Kicker’s Waltz.
[US]Literary Digest 10 Apr. 12: Clover kicker. Farmer, rube.
[US] in DARE.

2. a rustic, a farmer.

[US]Seattle Star (WA) 11 Nov. 8/3: ‘The gimp was doing the royal with some clover-kicker at the next board.’ [The boss was entertaining a friend from the country at the next table].
[US]N.Y. Tribune 9 Dec. 14/2: ‘Wild Bill’ Doig [...] the amibitious hay-shaker and clover-kicker had been fined $25.
[US]Berrey & Van den Bark Amer. Thes. Sl. §391.3: rustic, bumpkin, clover kicker.
[US]Monteleone Criminal Sl. (rev. edn).
[US]Wentworth & Flexner DAS.