Crossword Genius

Fish with a musical tail (4)

Ross

I believe the answer is:

coda

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But I can't explain it at all! Could you help me understand?

(Other definitions for coda that I've seen before include "Final passage" , "Ending of musical piece" , "Closing part of a musical composition" , "Concluding section" , "finale in Beethoven?" .)

I've seen this clue in The Mirror and The Sun.
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