Crossword Genius

Room for experiment? (3)

Ross

I believe the answer is:

lab

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'room' is the definition.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lab that I've seen before include "Socialist" , "retriever" , "Dog" , "In brief, a room for scientific experiments" , "Science workshop" .)

I've seen this clue in The Mirror.
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