Crossword Genius

Room for family dog? (3)

Ross

I believe the answer is:

lab

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'dog?' is the definition.
(short for labrador)

I can't explain the rest of the clue.

Can you help me to learn more?

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

I've seen this clue in The Mirror.
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