German city's missing hotel by river, previously knocked down (3,4)

'knocked down' is the definition.
(both can mean hit with a car)

'german city's missing hotel by river previously' is the wordplay.
'german city' becomes 'Hanover' (city in Germany).
'missing' suggests deleting specific letters.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'by river' becomes 'r' (abbreviation for river. I am not sure about the 'by' bit.).
'previously' means one lot of letters go next to another.
'hanover' with 'h' taken away is 'anover'.
'anover' after 'r' is 'RAN OVER'.