Crossword Genius

No longer fizzy (4)

Ross

I believe the answer is:

flat

'no longer fizzy' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for flat that I've seen before include "Dull; set of rooms" , "like some races" , "Featureless" , "Punctured tyre" , "Dull; apartment" .)

I've seen this clue in The Mirror, the Newsday and The Guardian.
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