Once the diet's worked, no longer is (7)
I believe the answer is:
existed
'once' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives sometimes mean the same thing.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Another definition for existed that I've seen is " Lived".)
I've seen this clue in the Evening Standard.
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