Noise made by a brutal gathering (7)
I believe the answer is:
accrual
This could be a double definition.
'noise' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'a brutal gathering' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'made by' is the link.
Can you help me to learn more?
(Other definitions for accrual that I've seen before include "Increase in money" , "Something building up" , "Increment - accumulation" , "Build up of regularly received amounts" , "Slow increase (of e.g. capital)" .)