Enables GTPase binding activity and peptide binding activity. Involved in endocytosis. Located in clathrin-coated pit and clathrin-coated vesicle. Part of clathrin coat. Is active in presynaptic endocytic zone membrane and synaptic vesicle membrane. Orthologous to human CLTA (clathrin light chain A). [provided by Alliance of Genome Resources, Apr 2022]