Establish a scientific organisation (9)
I believe the answer is:
institute
This clue could be a double definition.
'establish' is the first definition.
(I know that establish can be written as institute)
'a scientific organisation' is the second definition.
'institute' can be an answer for 'organisation' (institute is a kind of organization). I'm not sure about the 'a scientific' bit.
Can you help me to learn more?
(Other definitions for institute that I've seen before include "college" , "Set in motion, establish" , "Found; an establishment" , "Organisation for promotion of scientific or educational activity" , "Establish - seat of learning" .)