The school for chemists? (10)
I believe the answer is:
elementary
This clue is a double definition.
'the school' is the first definition.
(elementary school is a kind of school)
'for chemists?' is the second definition.
(whimsical reference to chemical elements)
(Other definitions for elementary that I've seen before include "Primary" , "Rudimentary; introductory" , "Principal" , "Simple, my dear Watson!" , "Basic, simple" .)