Has a role in the RNA interference (RNAi) pathway which is important for heterochromatin formation and accurate chromosome segregation. A member of the RNA-directed RNA polymerase complex (RDRC) which is involved in the generation of small interfering RNAs (siRNAs) and mediate their association with the RNA-induced transcriptional silencing (RITS) complex. RITS acts as a priming complex for dsRNA synthesis at the site of non-coding centromeric RNA. ATP + RNA(n) = diphosphate + RNA(n)-3'-adenine ribonucleotide Cid12, hrr1 and rdp1 interact forming the RNA-directed RNA polymerase complex (RDRC). The RDRC complex interacts with the RITS complex via interaction between ago1 and hrr1. Clr4 has a role in mediating this interaction. Belongs to the DNA polymerase type-B-like family.