The answer may be found in the lab (6)

I believe the answer is:

retort

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

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

(Other definitions for retort that I've seen before include "Witty answer" , "Come back" , "Answer back" , "Sharp reply - lab vessel" , "Long-necked glass vessel" .)

I've seen this clue in the Evening Standard.

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