clojure deferred function execution

Ok Here is what i am trying to do

(defn addresses [person-id]
 ;addresses-retrival )

(defn person [id]
  (merge  {:addresses (addresses id)} {:name "john"}))

In the above person function i want addresses to be retrieved only on demand , like only when i do

(:addresses (person 10)) 

and not when

(person 10)

I am not sure if i am going about this right, being new to clojure.