You basically have two choices.
Choice 1, give names to each of your nodes, and link names to names.
(def cycle {:a {:value 2, :link :b}, :b {:value 3, :link :a}}
Choice 2, use one of Clojure's reference types
(def a (ref {:value 2}))
(def b (ref {:value 3}))
(dosync (alter a assoc :link b) (alter b assoc :link a))
I tend to prefer Choice 1, when applicable.
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