Fish in turbulent creek caught by male, endlessly (8)
I believe the answer is:
mackerel
'fish' is the definition.
(mackerel is a kind of fish)
'turbulent creek caught by male endlessly' is the wordplay.
'turbulent' indicates anagramming the letters.
'caught by' is an insertion indicator.
'endlessly' means to remove the last letter.
'creek' is an anagram of 'ckere'.
'male' with its final letter taken off is 'mal'.
'ckere' put into 'mal' is 'MACKEREL'.
'in' is the link.
(Other definitions for mackerel that I've seen before include "Banded food fish" , "Common food fish" , "Common striped fish, very tasty" , "Fish caught by spinner (or sprat?)" , "One in school" .)