Flat fish (6)
'flat fish' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ray that I've seen before include "Man who engaged in surrealist photography" , "Beam; flat-bodied fish" , "Shaft of light" , "Man, maybe" , "bit of sunshine" .)
(Other definitions for flounder that I've seen before include "Struggle in water" , "Catch" , "Flatfish - behave awkwardly" , "Fish; stagger clumsily" , "Grope around" .)
'flat fish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for plaice that I've seen before include "Ice, pal, will catch this fish" , "N. Atlantic flatfish" , "Flatfish; sounds like put" , "Large flat fish" , "Important food fish" .)