Knocking over in the street (7)
I believe the answer is:
downing
'knocking' is the definition.
The answer and definition can be both to do with contact as well as being present participle verbs.
Perhaps you can see an association between them that I don't see?
'over in the street' is the wordplay.
I cannot quite see how this works, but
'over' could be 'o' (cricket abbreviation) and 'o' is located in the answer.
'in' is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for downing that I've seen before include "and 17: Thoroughfare of government" , "College of Cambridge" , "Street that houses British P.M." , "Drinking" .)