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The answer's in the lab (6)

Ross

I believe the answer is:

retort

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

I can't explain the remainder of the clue.

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(Other definitions for retort that I've seen before include "Quick answer - laboratory vessel" , "Answer in retaliation" , "Lab. vessel; quip" , "Rotter (anag.)" , "Witty/sharp reply" .)

I've seen this clue in the Evening Standard.
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