From the fish, back to the bird (6)
I believe the answer is:
parrot
'bird' is the definition.
(I know that parrot is a type of bird)
'from the fish back to' is the wordplay.
I cannot really understand how this works, but
'from' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
'fish' could be 'parr' (type of fish) and 'parr' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'the' acts as a link.
Can you help me to learn more?
(Other definitions for parrot that I've seen before include "Mechanically repeat; bird" , "Unintelligent imitator" , "Mimic speech like colourful bird" , "Lory" , "Spout" .)