Ducks carrying rook touch down in US city (7)
I believe the answer is:
orlando
'us city' is the definition.
(I've seen this before)
'ducks carrying rook touch down' is the wordplay.
'ducks' becomes 'OO' (duck means zero in cricket).
'carrying' means one lot of letters goes inside another.
'rook' becomes 'R' (chess abbreviation).
'touch down' becomes 'land' (I've seen this in another clue).
'r'+'land'='rland'
'oo' placed around 'rland' is 'ORLANDO'.
'in' acts as a link.
(Other definitions for orlando that I've seen before include "US city" , "somewhere in Florida" , "Shakespeare hero - book by Virginia Woolf" , "Florida resort -- Virginia Woolf novel" , "Disney World location" .)