For greater clarity, I've cleaned up the code and broken it into 2 files, 
record-play0 and record-play:

(ns aatree.record-play0)

(set! *warn-on-reflection* true)

(defrecord base [])

(defn new-base [opts]
  (-> (->base)
      (into opts)
      (assoc :blap (fn [this] 42))))

(defrecord wackel [])

(defn new-wackel [opts]
  (-> (->wackel)
      (into opts)
      (assoc :blip (fn [this x y z] (+ x y z)))))


---


(ns aatree.record-play
  (:require [aatree.record-play0 :refer :all]))

(set! *warn-on-reflection* true)

(defprotocol gran
  (blip [this x y z])
  (blap [this]))

(def w (-> {} new-base new-wackel))

(extend-type aatree.record_play0.wackel
  gran
  (blip [this x y z]
    ((:blip this) this x y z))
  (blap [this]
    ((:blap this) this)))

(def w (-> {} new-base new-wackel))

(println (blip w 1 2 3))                                    ; -> 6

(println (blap w))                                          ; -> 42


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