As good as it gets (5)

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ideal

'as good as it gets' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ideal that I've seen before include "Paradigm" , "Model of ethical behaviour" , "without a flaw" , "Exemplar" , "'Perfect, model (5)'" .)

I've seen this clue in The New York Times, the Penny Press, the LA Times and The Guardian.

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