Garden bird (7)
(Other definitions for sparrow that I've seen before include "A chirrupy city bird" , "Cock Robin's killer" , "Little brown bird" , "Small songbird" , "House bird" .)
(Other definitions for great tit that I've seen before include "Bird changed" , "Common small bird with yellow breast" , "Black-headed bird" , "Singer" , "A bird; target it (anag)" .)