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SOMEPEOPLE"Unbelievable!" ... or what 17-, 25-, 35- and 46-Across are made from, letter-wise? KOOKABURRAThis bird sits in the old gum tree (10) GARDENHOSEKid’s knocked over shed one rebuilt – a wind-up for the horticulturalist? (6,4) ENANTIOMERAwkwardly mention ear — it's one of a pair, the mirror image of the other ALASKAROLLSushi bite topped with salmon BROOMSTICKWitch carrier (10) DUSSELDORFEuropean city recovering from disappointment, investing not as much (10) CONTAGIOUSLike laughter, sometimes ISLEOFDOGSReportedly, I adore residents of Battersea, part of London BEAUTYMARKEnhancing "blemish" (3x) SETTOMUSICNoted work? EMANCIPATEEuropean chap worried about withdrawn photo's release THATSMARTS"Ouch!" ARCHIMEDESOld Greek building new semi, having notes