INTERLOPER

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city recovering from disappointment, investing not as much (10) EMANCIPATEEuropean chap worried about withdrawn photo's release BEAUTYMARKEnhancing "blemish" (3x) GARDENHOSEKid’s knocked over shed one rebuilt – a wind-up for the horticulturalist?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