Alternatively, come down over city (7)
I believe the answer is:
orlando
'city' is the definition.
(I've seen this before)
'alternatively come down over' is the wordplay.
'alternatively' becomes 'or'.
'come down' becomes 'land' (to land is to come down after flying).
'over' becomes 'o' (cricket abbreviation).
'or'+'land'+'o'='ORLANDO'
(Other definitions for orlando that I've seen before include "place in Florida" , "Bloom in film" , "American themepark location" , "Shakespeare hero - book by Virginia Woolf" , "southeastern city" .)