Science room (3)
'science room' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lab that I've seen before include "Experimental facility" , "retriever" , "Dog" , "Scientist's workroom" , "Workplace for researcher" .)
'science room' is the definition.
'laboratory' can be an answer for 'room'. I also know that 'science' relates to this answer.
This is the entire clue.
(Other definitions for laboratory that I've seen before include "Experimental area" , "Place for experimentation" , "Language-learning facility" , "Where one investigates" , "Where litmus paper could be" .)