15a. Undoubtedly upsetting to the U.S.A.,sir! (6) ?U?S?? 18d. The end of the last ceremony in need of modernisation (5) T?I?? 20a. Made regular journeys and worked at one's trade P?I?D (Was thinking of plied as in plied ones trade, but don't know where the regular journeys bit fits in!!) 23a. Enclosures for water birds (4) ???S