The Collaborative International Dictionary of English v.0.48:

Circler \Cir"cler\, n.
   A mean or inferior poet, perhaps from his habit of wandering
   around as a stroller; an itinerant poet. Also, a name given
   to the cyclic poets. See under Cyclic, a. [Obs.] --B.
   Jonson.
   [1913 Webster]