Crossword Genius

Political choice possibly testing chamber? (10)

Ross

I believe the answer is:

laboratory

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This clue could be a double definition.

'political choice' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'testing chamber?' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'possibly' is the link.

Can you help me to learn more?

(Other definitions for laboratory that I've seen before include "Place of scientific research" , "Place for experimentation" , "Language-learning facility" , "Where researchers work" , "Where litmus paper could be" .)

I've seen this clue in The Telegraph.
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