Choice of mainstream parties to defend a scientific research site (10)
I believe the answer is:
laboratory
'scientific research site' is the definition.
I know that both 'scientific' and 'research' relate to this answer. I also know that both the answer and definition are singular nouns
'choice of mainstream parties to defend a' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'to' is within the answer.
'a' is within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for laboratory that I've seen before include "Place of scientific research" , "Experimental facility" , "workplace" , "Where researchers work" , "Place for experimentation" .)