Not be honest about alcoholic drink and soft one (7)

I believe the answer is:

limeade

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'soft one' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for limeade that I've seen before include "Citrus drink" , "Fizzy drink" , "it's a soft one" , "Fruity drink" , "soft drink" .)

I've seen this clue in The Times.

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