Door in Parisian brown study (8)
I believe the answer is:
entrance
'door' is the definition.
(I've seen this in another clue)
'in parisian brown study' is the wordplay.
'in parisian' becomes 'en' ('in' in French).
'brown study' becomes 'trance' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'en'+'trance'='ENTRANCE'
Can you help me to learn more?
(Other definitions for entrance that I've seen before include "Way in - fascinate" , "An actor's coming on stage" , "Right of admission" , "Opening to allow access" , "seventeen [POSTERN], perhaps" .)