If you consider Clojure Lisp-related there's https://m.soundcloud.com/defn-771544745 (disclaimer: I'm a co-host) and there is http://blog.cognitect.com/cognicast/ from Cognitect (the company that stewards Clojure)
I also came across (not a Lisp-devoted series admittedly) but an episode of another podcast which focusses on Racket [https://softwareengineeringdaily.com/2015/11/04/racket-with-...].
I haven't found any podcast series devoted to (Common) Lisp or Scheme so far though.