Green’s Dictionary of Slang

clotty n.

[ety. unknown; ? link to Yorks. dial. cloddy, an awkward, ill-dressed person]

(Irish) a general term of abuse.

[Ire]T. Murphy A Crucial Week in the Life of a Grocer’s Assistant (1978) Scene i: Heeding that hussy of a clotty of a plótha of a streeleen.