Crossword Genius

Buff cast vetoed coda for once (7)

Ross

I believe the answer is:

devotee

I'm a little stuck... Click here to teach me more about this clue!

'buff' is the definition.
(I know that buff can be written as devotee)

'cast vetoed coda for once' is the wordplay.
I cannot really understand how this works, but
an anagram of 'vetoed' is 'devote' which is located in the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for devotee that I've seen before include "Big fan" , "Zealous follower" , "Great fan" , "A very loyal or loving person" , "dedicated person" .)

I've seen this clue in The Daily Express.
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