Read "Poet in A Barroom" at The Eldritch Dark:
I can't help suspecting that this haiku from Clark Ashton Smith (CAS) was inspired by a personal experience, given that CAS was known to sometimes frequent bars in his hometown of Auburn, California.
There's a sense of isolation in the final line "One peers from a time-lost star." The life of a poet working in a small rural town must have had many challenges, and CAS' letters often speak of his frustration with his circumstances, as an artist living in a community that did not seem to place great value on creative endeavors.
Despite that, the sense of isolation in "Poet in A Barroom" is not complete; the speaker appears to be including himself amongst those who "Throng the bar". If indeed this poem is autobiographical, I think that sentiment reflects the fact that CAS was not aloof, although perhaps something of a reserved personality.