Chemist's workroom (3)

I believe the answer is:

lab

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

This is the entire clue.

(Other definitions for lab that I've seen before include "Socialist" , "Experimental facility" , "Chemist's workroom" , "Workplace for researcher" , "biology classroom?" .)

I've seen this clue in the Newsday.

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