Sound spot for fish (6)
I believe the answer is:
plaice
'fish' is the definition.
(plaice is a kind of fish)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for plaice that I've seen before include "Brown flatfish" , "Swimmer" , "Flatfish; sounds like put" , "Edible flatfish" , "Ice, pal, will catch this fish" .)