The din is sounding like a tennis bat (6)
I believe the answer is:
racket
This could be a double definition.
'the din' is the first definition.
(I've seen this before)
'a tennis bat' is the second definition.
(I've seen this before)
'is sounding like' is the link.
I am not very happy about this link. Some or all of it may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for racket that I've seen before include "Unpleasant din" , "Sports equipment" , "Lot of noise, or tennis bat" , "Clamour; tennis bat" , "Din; snowshoe" .)