Swimming tutor floundering! (5)
I believe the answer is:
trout
'swimming' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'tutor floundering' is the wordplay.
'floundering' indicates anagramming the letters.
'tutor' anagrammed gives 'TROUT'.
Can you help me to learn more?
(Other definitions for trout that I've seen before include "interfering old woman" , "old bag" , "Fish of salmon family" , "Fish (associated with Schubert?)" , "Mistiness" .)