Crossword Genius

Except that retribution is far from complete (3)

Ross

I believe the answer is:

but

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

'except that' is the definition.
(I've seen this in another clue)

'retribution is far from complete' is the wordplay.
'BUT' is hidden within the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for but that I've seen before include "Nevertheless, on the other hand" , "Except; nevertheless" , "On the contrary" , "Save" , "Only; apart from" .)

I've seen this clue in the Evening Standard.
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