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Wherein, in short, chemists labour (3)

Ross

I believe the answer is:

lab

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'labour' is the definition.
(abbreviation)

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(Other definitions for lab that I've seen before include "In brief, a room for scientific experiments" , "Research workroom" , "SECOND PART OF 15" , "retriever" , "Room for scientist" .)

I've seen this clue in the Evening Standard.
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