Green’s Dictionary of Slang

claret v.

(orig. boxing) to draw blood, to bleed.

1817		Wkly Dispatch (London) 12 Oct. 328/1: Turner planted two clean hits without experiencing any return. A good rally followed, during which the mug of Scroggins was clareted.
1823		J. Catnach Tom and Jerry’s Rambles Through Paris 1: O! jemminy, you would have laugh’d t’ see this glorious rout, They mill’d Monsieur so cleverly, and clareted his snout.
1825		Pierce Egan’s Life in London 19 June 165/2: The mug of his antagonist [...] was clareted all over.
1832		Egan Bk of Sports 46: Both their mugs were clareted.
1845		Bell’s Life in Sydney 6 Sept. 4/2: But quickly on his pins again he meditates a teaser / Bungs up the eye of Bungaree and clareted his sneezer.
1855		(con. 1820) Fights for the Championship 61: Oliver’s face was clareted all over.

In derivatives

clareter (n.)

a blow that draws blood.

1825

Pierce Egan’s Life in London 2 Jan. 389/2: [H]e received a teazer on the nose, a winker between the ogles, and a clareted [sic] on his daffy passage .