17a seems to be a hybrid double definition / &lit. "Honey" or an example of something "one may give to boxer [dog]."
11d: defn. "Means of making people believe", parses as 3 ("lingerie") + (2,7) ("not ready to wear"), Funny clue!
18d: Homophone ("in the auditorium"). Defn. "spectacles etc.", parses as 3, 4 ("Everyman becomes tedious"). Also funny IMO.