Horatian work of ca. 18 B.C.

ARSPOETICA

This Latin treatise on poetry’s craft shares its name with a phrase meaning "the art of poetry."

This clue points to Ars Poetica, a famous poem by the Roman poet Horace written around 18 B.C. The title translates to "The Art of Poetry," and it’s often called the Horatian work because it reflects his views on writing. The answer is Latin, so it’s spelled as one word without spaces—ARSPOETICA—which fits crossword conventions for classical titles. If you know Horace’s influence on literature, this one clicks right into place.