Where lots are knocked down (7)
I believe the answer is:
auction
This might be a double definition.
'where lots are knocked' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'down' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
Can you help me to learn more?
(Other definitions for auction that I've seen before include "Public sale - type of bridge" , "Public bidding sale" , "Public sale to highest bidders" , "Caution about method of sale" , "Selling" .)