The function of C1RL (complement C1r subcomponent like, Ensembl gene identifier ENSG00000139178) is as follows. Mediates the proteolytic cleavage of HP/haptoglobin in the endoplasmic reticulum. {ECO:0000269|PubMed:15358180, ECO:0000269|PubMed:15385675, ECO:0000269|PubMed:15527420}.