One island with enough noise for eight (4)
I believe the answer is:
eyot
'one island' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for eyot that I've seen before include "Islet found in a river, (especially in England)" , "land in the river" , "Small river island" , "There's one at Chiswick" , "isle" .)