Crossword Genius

Last part is false — authentic originally (4)

Ross

I believe the answer is:

coda

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'last part' is the definition.
(I've seen this in another clue)

'false authentic originally' is the wordplay.
'false' becomes 'cod' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'originally' indicates taking the first letters.
The initial letter of 'authentic' is 'a'.
'cod'+'a'='CODA'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for coda that I've seen before include "Concluding passage of a musical composition" , "noted conclusion" , "Closing passage of a piece of music" , "Ending of musical piece" , "Final part of mus. structure" .)

I've seen this clue in The Times.
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