Clumsily rinsed a fish (7)
I believe the answer is:
sardine
'fish' is the definition.
(sardine is a type of fish)
'clumsily rinsed a' is the wordplay.
'clumsily' is an anagram indicator.
'rinsed'+'a'='rinseda'
'rinseda' with letters rearranged gives 'SARDINE'.
(Other definitions for sardine that I've seen before include "Rinsed a (anag) - fish" , "Swimmer" , "Small fish, usually canned" , "(Cramped?) fish" , "A diner's small fish" .)