Fish struggle like fish out of water? (8)
I believe the answer is:
flounder
'struggle like fish out of water?' is the definition.
(to flounder is to struggle or be in difficulty)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for flounder that I've seen before include "Catch" , "Stagger clumsily in mud (or water)" , "fumble?" , "Have difficulty" , "Flatfish - behave awkwardly" .)